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Home / DTC / P0A07 — Motor Electronics Coolant Pump A Control Circuit High

P0A07 — Motor Electronics Coolant Pump A Control Circuit High

Detailed page for trouble code P0A07.

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P0A07

Generic P — Powertrain

Motor Electronics Coolant Pump A Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 17 RU: 16
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Page language: EN

Causes

  • Open or shorted wiring in coolant pump control circuit
  • Short to battery voltage on the pump control wire
  • Corroded/damaged connector at pump or module
  • Failed coolant pump driver inside the PCM/ECM or motor control module
  • Faulty coolant pump (internal short or wiring fault)
  • Blown or incorrect fuse/failed relay feeding the pump power or driver

Symptoms

  • Malfunction indicator lamp (MIL) or specific coolant pump warning
  • Cooling pump not operating when commanded, or running continuously
  • Engine temperature warnings or elevated coolant temperature
  • Reduced performance or limp-home mode on hybrid/EV systems (if pump is critical for inverter/motor cooling)
  • Erratic pump operation or clicking/relay noise at times

What to check

  • Retrieve and record freeze frame data and related codes; note operating conditions when fault set
  • Visually inspect coolant pump connector, wiring harness, and ground points for damage, corrosion, or pin damage
  • Check relevant fuses and relays for proper value and operation
  • With key on (engine off) and/or engine running as applicable, measure voltage at the pump power and control pins vs. ground
  • Measure control circuit voltage with PCM commanding pump ON and OFF (watch for PWM behavior)
  • Measure pump motor resistance (power to motor disconnected) and compare to specification; check for internal short to chassis

Signal parameters

  • Typical control: 0 V (off) to battery voltage (on) in a 12 V system; many systems use PWM between ~0–12 V (duty cycle varies with demand)
  • Fault condition: control line measured stuck at battery voltage or higher when PCM commands low or sees voltage above manufacturer threshold
  • Pump motor power feed should show battery voltage when fused feed is present; control pin should be low or PWM (manufacturer-specific)
  • Exact thresholds and PWM frequency vary by manufacturer — refer to service data for expected voltages and waveform shapes

Diagnostic algorithm

  1. Confirm code and related freeze-frame data with a scanner; record any accompanying codes.
  2. Perform a visual inspection of wiring, connectors, fuses and relays for the pump circuit. Repair obvious damage.
  3. Verify power and ground at the pump: with ignition ON, check battery feed, fused feed and ground integrity.
  4. With connector disconnected, measure resistance of pump motor between power and ground to check for internal short or open (compare to spec).
  5. Back-probe the pump control pin. With PCM commanding OFF, verify control voltage is low; with PCM commanding ON, verify PWM or proper voltage. Use an oscilloscope if available to confirm waveform.
  6. If control line is high when commanded OFF, isolate by disconnecting the pump and re-check. If the signal goes low with pump disconnected, suspect pump wiring or pump causing backfeed. If signal remains high with pump disconnected, suspect short to B+ or driver fault in module.
  7. Check for short to battery by measuring continuity between control wire and battery positive with power removed. Repair any short.
  8. Repair or replace damaged wiring/connectors. If wiring and pump check good and the control line still reads high, suspect PCM/driver failure — verify with manufacturer diagnostic procedures before replacing the module.
  9. Clear code and perform a road/run cycle to confirm repair; monitor for reoccurrence.
  10. Note: follow all safety procedures when working near moving parts, hot coolant, or high-voltage systems on hybrids/EVs.

Likely causes

  • Short to B+ on the pump control feed (wire chafed, pin pushed out)
  • Connector corrosion/loose terminal at pump or module resulting in intermittent high readings
  • Failed PCM/ECM output stage (driver transistor) forcing circuit high
  • Internal pump motor fault creating backfeed into control circuit
  • Incorrect or missing fuse/relay allowing uncontrolled voltage on the control line

Fault status

⚠️ Status
P0A07 — Motor Electronics Coolant Pump A Control Circuit High: control circuit voltage higher than expected (short to B+ or driver/wiring fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

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P0A08 P0480 P0481 P0482 P0627
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