Code
P1664
ALFA ROMEO
P — Powertrain
Throttle angle repeat signal above maximum value
Views:
UK: 2
EN: 7
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
BUICK
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 14
EN: 26
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
CADILLAC
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 13
EN: 26
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
CHEVROLET
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 15
EN: 23
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
FIAT
P — Powertrain
Throttle angle repeat signal above maximum value
Views:
UK: 2
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
GM
P — Powertrain
1 4 Upshift Lamp Control Circuit
Views:
UK: 12
EN: 21
RU: 13
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
GMC
P — Powertrain
1 4 Upshift Lamp Control Circuit
Views:
UK: 14
EN: 25
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
HUMMER
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 5
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
LAND ROVER
P — Powertrain
Malfunction of the fuel injection pump
Views:
UK: 3
EN: 8
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
OLDSMOBILE
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 16
EN: 27
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Code
P1664
SAAB
P — Powertrain
Shift Up Output Signal From Control Module Malfunction
Views:
UK: 1
EN: 4
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P1664
SATURN
P — Powertrain
1-4 Upshift Lamp Control Circuit
Views:
UK: 11
EN: 23
RU: 14
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email