Code
P1660
ACURA
P — Powertrain
A/T FI Data Line Failure
Views:
UK: 20
EN: 32
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
BUICK
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 17
EN: 44
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
CADILLAC
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 17
EN: 35
RU: 32
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
CHEVROLET
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 16
EN: 39
RU: 31
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
DAEWOO
P — Powertrain
Cruise crct fault
Views:
UK: 1
EN: 4
RU: 7
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
FORD
P — Powertrain
Output Circuit Check Signal High
Views:
UK: 16
EN: 39
RU: 34
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
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0
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Code
P1660
GM
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 16
EN: 39
RU: 39
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
Code
P1660
GMC
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 21
EN: 43
RU: 36
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
HONDA
P — Powertrain
A/T FI Data Line Failure
Views:
UK: 15
EN: 35
RU: 30
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
HUMMER
P — Powertrain
Cooling Fan Control Circuits
Views:
UK: 9
EN: 16
RU: 16
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
INFINITI
P — Powertrain
A/T FI Data Line Failure
Views:
UK: 16
EN: 35
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
KIA
P — Powertrain
Power Stage Group 'B'
Views:
UK: 18
EN: 36
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
LINCOLN
P — Powertrain
Output Circuit Check Signal High
Views:
UK: 21
EN: 38
RU: 33
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P1660
MERCURY
P — Powertrain
Output Circuit Check Signal High
Views:
UK: 20
EN: 45
RU: 32
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Code
P1660
OLDSMOBILE
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 15
EN: 38
RU: 28
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Code
P1660
Other
P — Powertrain
Output Circuit Check Signal High
Views:
UK: 17
EN: 39
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Workshop ManualYour experience will help others
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Code
P1660
RAM
P — Powertrain
Emergency Stop Fuel Shut-Off Solenoid
Views:
UK: 2
EN: 2
RU: 5
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
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Code
P1660
SAAB
P — Powertrain
Control Module Pins NOT Used Are Connected To B+
Views:
UK: 2
EN: 5
RU: 9
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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👍 Like
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Code
P1660
SATURN
P — Powertrain
Cooling Fans Control Circuit
Views:
UK: 15
EN: 36
RU: 30
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
Code
P1660
SCION
P — Powertrain
Fuel cut control circuit malfunction
Views:
UK: 0
EN: 3
RU: 3
AI status
Completed
Completed
100%
Causes
- Open, short or intermittent wiring on the transmission-to-engine/ECM data line
- Corroded, loose or damaged connector pins at TCM, ECM or inline connectors
- Blown fuse or loss of power/ground to one of the controllers on the bus
- Failed or intermittent Transmission Control Module (TCM) or Engine Control Module (ECM/PCM)
- Aftermarket electronics, improper repairs or chafed harness causing intermittent contact
- Software or firmware mismatch/corruption in one of the control modules
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Transmission may go to limp/limitation mode or display abnormal shift behavior
- Loss of transmission-related data on scan tool or inability to communicate with TCM
- Stored and/or pending communication-related DTCs
- Intermittent driveability issues if engine and transmission data are out of sync
What to check
- Use a scan tool to read stored and pending codes and confirm P1660 is current, not history-only
- Attempt communication with both ECM and TCM; note any 'no response' or 'module not present' messages
- Visually inspect wiring harnesses and connectors for damage, corrosion, pin push-out or water intrusion
- Verify battery voltage and chassis/engine grounds are clean and secure
- Check fuses and power feeds for ECM and TCM circuits
- Perform a wiggle test on harness/connectors while monitoring live data for communication dropouts
Signal parameters
- Data line is a bidirectional communication bus (CAN or manufacturer proprietary serial). Confirm protocol from service manual.
- Typical idle single-ended voltages for CAN nodes ~2.5 V; CANH rises and CANL falls during active bits (refer to manual for exact expected voltages and bit timing).
- When communicating normally, data packets should be present on the bus; signals absent or constant voltage indicate open/short.
- Any sudden jumps to battery voltage or to ground on the data line indicate hard short to power/ground.
Diagnostic algorithm
- Retrieve all related codes and freeze‑frame data with a capable scan tool. Note whether TCM and ECM respond and their software IDs.
- Verify battery voltage is within spec and inspect/clean main engine and chassis grounds.
- Inspect connectors at the TCM and ECM, plus any inline connectors and junctions along the harness. Look for corrosion, bent pins, moisture or damage.
- Check fuses and power feeds for both modules. Repair any blown fuses and trace cause if fuse blows again.
- With ignition ON, use a DVM or oscilloscope to probe the data lines at the module connectors. Compare observed voltages and waveform activity to service manual specifications.
- Perform continuity checks (with battery disconnected) from module pins to intermediate connectors and to the other module to locate opens or high resistance. Repair wiring harness as needed.
- If intermittent, perform wiggle test while monitoring bus activity to reproduce fault. Secure and repair any harness chafe points or loose connectors.
- If wiring, power and grounds are good but communication still fails, consider swapping in a known-good TCM or ECM (if available) or perform module bench testing per manufacturer procedures.
- After repairs, clear codes and road test to verify the DTC does not return and that communication is stable.
- If code returns after module replacement, re-check wiring and perform advanced diagnostics per dealer service information (may require module reprogramming or network topology checks).
Likely causes
- Damaged connector or corroded pin at TCM or ECM (most common)
- Open or shorted data wire (pinched, chafed harness)
- Bad ground or supply to one of the modules on the data bus
- Faulty TCM or ECM after wiring and power/ground verified
- Intermittent contact due to vibration or water intrusion
Fault status
Status
A/T FI Data Line Failure — communication lost or abnormal between transmission control and engine/fuel injection systems (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
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