Code
P0700
AUDI
P — Powertrain
Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages
Views:
UK: 45
EN: 66
RU: 56
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
Generic
P — Powertrain
Transmission Control System (MIL Request)
Views:
UK: 42
EN: 65
RU: 50
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
GWM
P — Powertrain
- Transmission control system malfunction
Views:
UK: 17
EN: 37
RU: 30
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
HUMMER
P — Powertrain
Transmission Control System Malfunction
Views:
UK: 30
EN: 48
RU: 44
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
LAND ROVER
P — Powertrain
Transmission control system (malfunction indicator) lamp order
Views:
UK: 22
EN: 38
RU: 38
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
MERCEDES-BENZ
P — Powertrain
Transmission Control System Malfunction
Views:
UK: 37
EN: 55
RU: 46
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0700
MITSUBISHI
P — Powertrain
Transmission control system
Views:
UK: 29
EN: 50
RU: 40
AI status
Completed
Completed
100%
Causes
- Transmission Control Module (TCM) has set internal fault(s)
- Defective shift solenoids or solenoid pack
- Defective engine coolant temperature (ECT) or transmission temperature sensor affecting shift logic
- Valve body malfunction (sticking valves, wear)
- Dirty, burnt or contaminated transmission fluid restricting hydraulic passages and filter
- Wiring faults: damaged harness, corroded connector, poor ground or supply voltage to TCM or solenoids
Symptoms
- MIL/Check Engine light illuminated (P0700) and possible transmission warning light
- Transmission enters limp/safe mode (limited gears)
- Harsh, delayed, slipping or no shifts; failure to engage gears
- Unusual transmission-related noise; shudder or surge during shifts
- Poor fuel economy or drivability issues while transmission is in limp mode
- Stored additional TCM-specific codes when scanned with proper tool
What to check
- Use a capable scan tool to read PCM/ECM and TCM stored codes and freeze frame data — P0700 requires reading TCM for root codes
- Check for pending/confirmed TCM codes (e.g., shift solenoid codes, pressure control codes)
- Inspect transmission fluid level, color and smell; note presence of metal particles in pan/filter
- Visually inspect transmission wiring, connectors and grounds for corrosion, broken pins, damage or water intrusion
- Check battery voltage and chassis/engine grounds; low voltage can cause module faults
- Verify communication between ECM and TCM (CAN bus) with a scan tool
Signal parameters
- TCM stored fault code list and freeze frame snapshot
- Commanded shift solenoid status (ON/OFF or duty cycle) vs. actual solenoid response
- Transmission fluid temperature and engine coolant temperature readings
- Input and output shaft speed sensor readings (RPM) and gear commanded vs actual
- Transmission line pressure (dynamic) and pressure control solenoid duty/current
- TCM supply voltage and ground integrity
Diagnostic algorithm
- Read and record all stored and pending codes from both PCM/ECM and TCM using an OEM-level or bidirectional scan tool. P0700 indicates that additional TCM codes must be retrieved from the transmission module.
- Review freeze frame and live data for conditions when fault occurred (vehicle speed, engine load, temperatures, gear commanded).
- Visually inspect wiring and connectors at the transmission, solenoid pack, and TCM. Repair any corrosion, damaged wires, poor pins or loose connectors.
- Verify battery voltage and engine/chassis grounds; repair poor grounds or low charging voltage before further testing.
- Check transmission fluid level and condition (color, odor, debris). If fluid is burnt/contaminated or filter is clogged, perform fluid and filter change and re-test.
- If fluid/wiring are good, test individual shift solenoids: compare resistance to OEM spec, command solenoids with scan tool while monitoring current/duty, and listen/observe activation where possible.
- Monitor live data: commanded solenoid states, pressure control duty, input/output speeds, and temperature sensors. Look for mismatch between commanded and actual states or pressure abnormalities.
- If solenoids test OK electrically but hydraulic behavior is incorrect, inspect valve body and separator plate for worn or blocked passages; replace valve body or solenoid pack as indicated.
- Repair or replace faulty sensor (ECT/transmission temp) if it provides erroneous temperature data that affects shift strategy.
- After repairs, clear codes, perform relearn/adaptation procedures if required by manufacturer, and road test to confirm issue is resolved. Re-scan to ensure no new TCM codes set.
- If communication errors persist, diagnose CAN bus and module communication circuits or consider TCM replacement only after excluding wiring and power/ground issues.
Likely causes
- Specific TCM fault codes for a shift solenoid circuit (most common)
- Low/contaminated transmission fluid and clogged filter or passages
- Failed solenoid(s) or solenoid pack
- Faulty valve body or internal hydraulic failure
- Bad electrical connection, power/ground problem, or damaged wiring harness
- Faulty coolant/temperature sensor causing incorrect shift strategy
Fault status
Status
P0700 — Transmission Control System Malfunction. PCM detected TCM-stored fault(s); retrieve TCM codes with appropriate scan tool to identify root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
Similar codes
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