Code
P1766
DAEWOO
P — Powertrain
Torque reduc. sig. ct mal
Views:
UK: 0
EN: 3
RU: 0
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
FORD
P — Powertrain
Shift Solenoid D Performance
Views:
UK: 12
EN: 14
RU: 10
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
LINCOLN
P — Powertrain
Shift Solenoid D Performance
Views:
UK: 16
EN: 17
RU: 11
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
MERCURY
P — Powertrain
Shift Solenoid D Performance
Views:
UK: 13
EN: 18
RU: 9
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
MITSUBISHI
P — Powertrain
Input shaft speed sensor
Views:
UK: 4
EN: 4
RU: 6
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
RAM
P — Powertrain
Transmission Relay Stuck Off
Views:
UK: 2
EN: 4
RU: 3
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1766
VOLKSWAGEN
P — Powertrain
Throttle Angle Signal Stuck Off
Views:
UK: 13
EN: 15
RU: 13
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring in the torque reduction signal circuit
- Poor connector pin contact or damaged connector (PCM/TCM or sender module)
- Faulty sensor/module that generates the torque reduction request (TCM, traction control module, ABS, or ECM interface)
- Intermittent grounding or power supply fault affecting signal reference
- Software/firmware anomaly or a fault in the PCM/TCM
Symptoms
- Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
- Reduced engine torque / limp-home mode or noticeable power derate
- Transmission shifting abnormalities or failsafe behavior
- Traction control or ABS intervention when not expected
- Stored freeze-frame data showing fault conditions during detection
What to check
- Read and record all stored trouble codes and freeze-frame data with a scan tool
- Check for related codes (TCM, ABS, traction control, communication bus errors)
- Visual inspection of wiring, connectors, and grounds on transmission, TCM, ECM/PCM, and ABS
- Backprobe and monitor the torque reduction signal with a multimeter or scope while attempting to reproduce the fault
- Compare live data values to expected values and watch for intermittent changes while wiggling harness
Signal parameters
- Circuit type: typically a discrete logic or low-voltage pulse used as a request/enable (refer to factory data)
- Expected voltage: generally within 0–5 V logic range (inactive ≈ 0 V or pulsed low, active ≈ 5 V or pulsed high) — check OEM specs
- Reference signals: requires valid power (typically 5 V reference) and a good ground
- Signal behavior: may be steady logic level or a timed pulse during torque reduction events; use oscilloscope for waveform verification
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note when and under what conditions P1766 set.
- Identify which module is the signal source (TCM, ABS, traction control module) from wiring diagrams/service manual.
- Visually inspect connectors and wiring between signal source and PCM/TCM for damage, corrosion, pin push-out, or water ingress.
- With ignition on, backprobe the torque reduction signal circuit at the PCM/TCM connector and verify presence of proper reference voltage and ground.
- Use a lab scope to observe the signal waveform while recreating conditions that cause torque reduction; compare to OEM waveform.
- If signal is absent or incorrect, trace wiring for opens/shorts. Perform continuity and resistance checks to ground/power and between connectors.
- Repair any damaged wiring or connectors. After repair, clear codes and road test to confirm the fault does not return.
- If wiring and connectors test good and signal source module does not produce correct signal, consider module replacement or reprogramming per factory procedures.
- After repairs, confirm all related systems (transmission shifting, traction control, ABS) operate normally and no related codes are present.
Likely causes
- Damaged wiring or chafed harness between TCM/ABS module and PCM
- Corroded or loose connector at PCM/TCM or intermediate splice
- Faulty TCM, traction control module, or ABS module output driver
- Loss of 5V reference or ground at the signal circuit
- Incorrect or missing signal due to module programming/communication fault
Fault status
Status
Torque reduction signal circuit malfunction detected — control module is receiving no signal or an out-of-range signal that indicates the torque-reduction request is faulty or interrupted.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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