Code
P0742
Generic
P — Powertrain
Torque Converter Clutch Circuit Stuck On
Views:
UK: 25
EN: 32
RU: 32
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0742
GWM
P — Powertrain
- Clutch is defective
Views:
UK: 8
EN: 10
RU: 17
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0742
HUMMER
P — Powertrain
TCC System Stuck On
Views:
UK: 13
EN: 20
RU: 21
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0742
LAND ROVER
P — Powertrain
Torque converter clutch system stuck in
Views:
UK: 9
EN: 18
RU: 16
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0742
MERCEDES-BENZ
P — Powertrain
Torque Converter Clutch Circuit Stuck On
Views:
UK: 14
EN: 21
RU: 22
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0742
MITSUBISHI
P — Powertrain
DCC solenoid stuck ON
Views:
UK: 12
EN: 17
RU: 22
AI status
Completed
Completed
100%
Causes
- Shorted wiring (power feed shorted to TCC control circuit)
- Failed TCC solenoid (internal short or stuck mechanically)
- Faulty PCM/ECM driver output
- Poor or corroded connector/ground at the transmission harness
- Valve body or hydraulic faults causing TCC apply without electrical command
- Incorrect transmission fluid level or contaminated fluid causing valve sticking
Symptoms
- Check Engine Light (MIL) with P0742 stored
- Unexpected torque converter lockup at idle or low speed (engine lugging or stalling)
- Harsh engagement or poor idle quality
- Reduced fuel economy and increased transmission temperature
- Transmission slips or shudders when driving
- Unintended gear behavior or limp-in mode in some vehicles
What to check
- Retrieve freeze frame and full DTC list; note engine/transmission conditions when fault set
- Check TCC-related live data/commands with a scan tool (TCC command PWM/duty, TCC status if available)
- Visually inspect TCC solenoid connector and wiring for damage, pin corrosion, and proper mating
- Check transmission fluid level and condition (replace if contaminated)
- Measure resistance of the TCC solenoid coil (compare with factory spec)
- Backprobe solenoid connector while key on/engine running to check for commanded voltage/PWM and for unintended constant voltage
Signal parameters
- TCC control is usually a PWM or switched DC drive from PCM — commanded signal varies from 0% to near 100% duty depending on design
- When commanded OFF the control line should be inactive (no steady apply voltage); when ON the PCM provides the control signal (ground-switched or 12V-switched)
- Solenoid coil resistance typically low (single- to low double-digit ohms) — consult OEM spec before replacing; an open or near-short value indicates a fault
- Lab-scope: PWM frequency often in the tens to low hundreds of Hz (varies by manufacturer)
Diagnostic algorithm
- Read and record DTCs and freeze frame. Clear codes and attempt to reproduce fault during road test to confirm persistence.
- Check TCC command vs TCC status (if available) with a scan tool. Note if PCM is commanding OFF but TCC is ON.
- Visually inspect wiring, connector, and transmission ground. Repair any damaged wiring or corroded pins.
- Disconnect TCC solenoid connector. With key on (engine off) measure voltage at harness connector to check for constant power/ground when circuit should be off. If constant voltage present, suspect wiring short or PCM driver.
- Measure TCC solenoid coil resistance at the solenoid. Compare to spec. If shorted or open, replace solenoid.
- If harness shows correct inactive state when disconnected but TCC still applies, suspect internal hydraulic/valve-body issue — remove valve body or transmission for internal inspection only after confirming electrical circuit is good.
- If wiring checks are inconclusive, perform bench test: apply proper voltage to solenoid to confirm it energizes/releases correctly. Replace solenoid if it remains stuck when unpowered.
- If electrical tests indicate PCM driver stuck ON (power present only when PCM connected), consult manufacturer procedures to verify PCM output and replace PCM only after ruling out harness/ground/shorts.
- After repairs, clear codes and perform a full road test while monitoring TCC command and operation. Verify no recurrence of P0742.
Likely causes
- TCC solenoid electrically stuck on (internal short or welded contacts)
- Harness short to constant 12V or stuck-to-ground at solenoid connector
- Corroded/loose transmission ground allowing stray current to hold solenoid
- Valve body stuck/pressure bleed that mechanically holds clutch applied
- PCM driver transistor failure (less common)
Fault status
Status
P0742 — Torque Converter Clutch Circuit Stuck On. PCM detects TCC applied when it should be off; likely electrical or solenoid/valve-body fault.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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👍 Like
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👎 Dislike
0
Send to email