Home / DTC / P1229 — Intercooler Pump Driver Fault

P1229 — Intercooler Pump Driver Fault

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Code

P1229

FORD P — Powertrain

Intercooler Pump Driver Fault

Brand: FORD
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

P1229

JAGUAR P — Powertrain

Electronic Throttle Control Circuit

Brand: JAGUAR
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

P1229

LINCOLN P — Powertrain

Intercooler Pump Driver Fault

Brand: LINCOLN
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

166

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Code

P1229

MERCURY P — Powertrain

Intercooler Pump Driver Fault

Brand: MERCURY
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

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Code

P1229

MINI P — Powertrain

Throttle position (TP) sensor - adaptation failure

Brand: MINI
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

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Code

P1229

Other P — Powertrain

Intercooler Pump Driver Fault

Brand: Other
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

9,532

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Code

P1229

PORSCHE P — Powertrain

Fuel injector, cylinder 5

Brand: PORSCHE
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

136

Browse 136 PORSCHE manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

PORSCHE

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Code

P1229

SAAB P — Powertrain

Injector Cyl. 5, Control Module Output, Short To Ground

Brand: SAAB
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

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Code

P1229

VOLKSWAGEN P — Powertrain

Cylinder 5 Injector Circuit Short To Ground

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Page language: EN

Causes

  • Failed intercooler pump motor (seized or open/short)
  • Blown fuse or faulty relay for the pump circuit
  • Open, shorted or corroded wiring or connector between pump and controller
  • Poor ground or low battery/charging system voltage
  • Faulty PCM/ECM driver transistor or module controlling the pump
  • Intermittent connector contact or water ingress

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced intercooler/charge-air cooling effectiveness
  • Turbocharger performance complaints (reduced boost, heat soak)
  • Possible limp mode or reduced power depending on calibration
  • Noise or no noise from pump area if pump is electrically powered

What to check

  • Read all stored and pending codes and note freeze-frame data with a capable scan tool
  • Visual inspection of pump, connector, wiring, and ground for corrosion, damage, or water intrusion
  • Verify battery voltage and good charging system operation
  • Check fuse and relay for the intercooler pump circuit
  • Backprobe pump connector to verify presence of supply voltage and control signal when commanded
  • Measure pump resistance and compare to specification or verify continuity

Signal parameters

  • Supply voltage: nominal battery voltage (~12 V) at pump fuse/relay feed with key ON
  • Control output: typically a switched ground or PWM drive from PCM — expected to switch between 0 V and near battery voltage when commanded
  • Pump resistance: low (continuity expected). Typical small pump motors draw several amps when running (varies by model)
  • Expected current draw: typically in the amp range under load (use vehicle manual for exact value)
  • If driver uses PWM, frequency and duty vary by application — check with oscilloscope or OEM data for exact parameters

Diagnostic algorithm

  1. Capture DTCs and freeze-frame data. Clear codes and attempt to re-create fault to confirm current condition.
  2. Perform a thorough visual inspection of the intercooler pump, harness, connector and ground points. Look for corrosion, loose pins, damage, or signs of water entry.
  3. Verify battery/charging voltage (12–14 V) at rest and under cranking load; low system voltage can cause false driver faults.
  4. Check fuse(s) and relay(s) for the pump circuit; replace or swap known-good relay to eliminate relay failure.
  5. With connector accessible, backprobe the pump connector. Command the pump ON with a scan tool and observe: a) supply voltage present at the fused feed, b) control conductor switching (voltage or pulsed ground), c) measure current draw. Use proper PPE and fused test leads.
  6. If no control signal from PCM but supply is present, check continuity from pump connector to PCM pin; inspect for opens/shorts. Repair any wiring faults.
  7. Bench-test the pump by applying fused battery power directly to the pump (observe polarity if applicable). If the pump does not run or draws excessive current, replace the pump.
  8. If pump and wiring test good but driver output remains absent or shorted, perform PCM output tests per manufacturer procedure. Replace PCM only after all wiring and loads are proven good.
  9. After repairs, clear codes and verify proper operation under drive conditions; monitor for reoccurrence and check for related codes that could indicate systemic issues.

Likely causes

  • Pump motor has failed or is mechanically locked
  • Fuse or relay supplying the pump circuit is blown/defective
  • Damaged harness between pump and module (pin corrosion, chafing, rodent damage)
  • Control output from PCM is damaged or stuck (driver transistor failure)
  • Low system voltage under load causing driver fault

Fault status

⚠️ Status
Intercooler Pump Driver Fault — the engine control module detected a problem controlling the intercooler pump circuit. Inspect pump, fuse/relay, wiring/connectors, grounds and the module driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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