Code
P1573
BUICK
P — Powertrain
PCM/EBTCM Serial Data Circuit
Views:
UK: 28
EN: 39
RU: 28
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
CADILLAC
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 24
EN: 38
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
CHEVROLET
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 24
EN: 36
RU: 28
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
CHRYSLER
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 27
EN: 37
RU: 32
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
FORD
P — Powertrain
Throttle Position Not Available
Views:
UK: 26
EN: 43
RU: 29
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
GM
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 26
EN: 36
RU: 27
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1573
GMC
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 24
EN: 42
RU: 30
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Send to email
Code
P1573
HUMMER
P — Powertrain
PCM/EBTCM Serial Data Circuit
Views:
UK: 10
EN: 17
RU: 13
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
LAND ROVER
P — Powertrain
Throttle position sensor not available
Views:
UK: 6
EN: 13
RU: 9
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
LINCOLN
P — Powertrain
Throttle Position Not Available
Views:
UK: 25
EN: 34
RU: 26
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
MERCURY
P — Powertrain
Throttle Position Not Available
Views:
UK: 24
EN: 44
RU: 32
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
MINI
P — Powertrain
Engine control module (ECM), sensor supply circuit B - low output
Views:
UK: 1
EN: 3
RU: 1
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
OLDSMOBILE
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 23
EN: 32
RU: 28
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1573
Other
P — Powertrain
Throttle Position Not Available
Views:
UK: 29
EN: 34
RU: 30
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1573
SATURN
P — Powertrain
PCM EBTCM Serial Data Circuit
Views:
UK: 23
EN: 37
RU: 27
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1573
VOLKSWAGEN
P — Powertrain
Left Engine Mount Solenoid Valve Open Circuit
Views:
UK: 23
EN: 36
RU: 25
AI status
Completed
Completed
100%
Causes
- Open, short or high resistance in the serial data wiring between PCM and EBTCM
- Corroded / loose connectors or pin damage at PCM, EBTCM or splice points
- Failed PCM or EBTCM
- Blown fuse or poor battery/ground connections causing voltage irregularities
- Aftermarket electronics or modules loading/shorting the data bus
- Intermittent wiring damage (rubbed through, water intrusion, rodent damage)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/Traction control warning lights
- Loss of traction control / stability control functions
- Intermittent or permanent loss of communication with EBTCM on scan tool
- Related drivability or braking system warnings
- Possible limp-in behavior if other modules lose PCM data
What to check
- Connect a capable scan tool; read all stored U/P codes and module presence/status
- Check battery voltage and main grounds; verify stable voltage (12.4–14.6 V with engine running)
- Inspect EBTCM and PCM connectors for corrosion, bent pins, water, or damage
- Check fuses and power feeds for PCM/EBTCM
- Wiggle/operate harness while watching live data or communication status for intermittent faults
- Use backprobe or scope to verify serial data activity on the bus at PCM and EBTCM
Signal parameters
- Vehicle may use GM Class 2 single-wire serial data or GMLAN/CAN — consult model-specific wiring manual
- Class 2: single-wire asynchronous pulses; expect periodic traffic when key ON/crank (no steady DC level)
- CAN (if used): differential idle ~2.5 V (both lines); active frames show opposing voltages — verify with scope
- No continuous short to battery or ground on the data line(s); resistance between data circuit and ground/battery should not be low
- Signal integrity: look for clean digital pulses, correct voltage swing, and no excessive noise or missing frames
Diagnostic algorithm
- Verify battery voltage and good engine/chassis grounds. Fix any charging or ground issues first.
- Use a scan tool and confirm P1573 along with any other communication codes. Note whether EBTCM is present/communicating.
- Clear codes and attempt to reproduce. If P1573 returns immediately, proceed to wiring checks.
- Visually inspect connectors and wiring between PCM and EBTCM for damage, corrosion, or water intrusion. Repair damaged wiring/connectors.
- Backprobe the serial data line(s) at the EBTCM and PCM. With a scope (preferred) or logic tool, verify valid data pulses/frames with key ON/crank.
- If no data or noisy signal, isolate by disconnecting aftermarket devices or non-essential modules on the same bus and re-test.
- Check continuity and resistance of the data wiring between PCM and EBTCM; look for opens, shorts to ground/power, or high resistance at connector terminals.
- If a short to ground/power is suspected, remove sections of harness or disconnect modules one at a time to locate the short.
- If wiring and power/grounds are good but communication still fails, swap or bench-test the EBTCM (if available) or replace with a known-good module and verify. Do not replace modules prematurely—confirm fault isolation first.
- After replacement of any module, program/configure per factory procedures and recheck for codes and proper communication.
Likely causes
- Damaged connector at EBTCM or PCM (water/corrosion)
- Open/short in single-wire serial bus or CAN wiring between the two modules
- Faulty EBTCM (common on vehicles with water intrusion in ABS module)
- Poor battery/ground causing module reset and lost communication
Fault status
Status
PCM/EBTCM serial data circuit malfunction — communication fault detected between PCM and EBTCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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