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Home / DTC / P1229 — Intercooler Pump Driver Fault

P1229 — Intercooler Pump Driver Fault

Detailed page for trouble code P1229.

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Code

P1229

MERCURY P — Powertrain

Intercooler Pump Driver Fault

Brand: MERCURY
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed intercooler pump motor
  • Open or short in pump power or ground circuit
  • Corroded/loose connector at pump
  • Blown fuse or faulty relay for pump circuit
  • PCM output (driver) fault or internal short
  • Mechanical seizure or blockage of pump

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced intercooler/coolant pump operation or no pump operation
  • Elevated intake/intercooler temperatures under boost
  • Reduced engine performance or temporary derate/limp behavior
  • Audible loss of pump noise (pump not running)
  • Possible coolant leakage or wet connector if water intrusion occurred

What to check

  • Read freeze frame and full DTC list with a scan tool
  • Visually inspect intercooler pump, connector, and wiring harness for damage or corrosion
  • Check related fuses and relays for continuity and correct operation
  • With ignition ON (engine OFF) check battery voltage at pump connector
  • Listen for pump operation when commanded or during key‑on/start conditions
  • Check for related codes that may indicate wiring or PCM faults

Signal parameters

  • Intercooler pump command (PCM output) — ON/OFF or duty cycle
  • Pump status or feedback (if available)
  • Battery voltage (VBAT)
  • Voltage at pump positive terminal with pump commanded
  • Voltage at pump ground/return
  • Pump current draw (amps) during operation

Diagnostic algorithm

  1. Record DTC(s) and freeze frame data with scan tool. Note operating conditions when code set.
  2. Perform a visible inspection of pump, wiring, and connector. Look for corrosion, damaged insulation, crushed wires, and water intrusion.
  3. Verify fuse(s) and relay(s) for the intercooler pump circuit. Replace if open or intermittent.
  4. With ignition ON, measure battery voltage at the pump connector positive terminal. Then command pump ON with the scan tool (if supported) and measure voltage again.
  5. If commanded but no voltage at connector, trace back wiring to relay/PCM; check relay output and continuity to pump. Repair open/short as found.
  6. If battery voltage is present at pump connector when commanded but pump does not run, disconnect connector and bench‑test pump by applying fused 12 V directly to pump to confirm motor function. Replace pump if it fails.
  7. If pump runs when directly powered but not when commanded, check ground continuity and measure PCM output. Compare driver output (voltage or duty) to specification. If PCM output is missing or shorted to ground/battery, verify wiring harness; consider PCM replacement only after wiring and pump are proven good.
  8. Measure pump current while running. Excessive current indicates mechanical bind or short; very low/no current indicates open circuit or failed motor.
  9. Clear codes and perform road test under conditions that previously triggered the code. Re-scan for return of the fault.
  10. If intermittent, wiggle-test wiring and connectors while monitoring live data to reproduce the failure. Replace any damaged harness or connector. Update PCM software if TSB recommends.

Likely causes

  • Pump motor failure or seized pump
  • Open/short in wiring harness to pump (chafing, rodent damage, connector corrosion)
  • Blown fuse or failed relay supplying pump
  • Poor ground at pump or body/chassis ground point
  • PCM driver transistor failed

Fault status

⚠️ Status
Intercooler Pump Driver Fault — PCM detected abnormal current/driver condition on intercooler pump circuit. Inspect pump, wiring, fuses/relay, and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

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296

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