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Home / DTC / P0C1F — Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High

P0C1F — Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High

Detailed page for trouble code P0C1F.

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P0C1F

Generic P — Powertrain

Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 17 RU: 18
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Page language: EN

Causes

  • Open or high-resistance connection in the temperature sensor circuit
  • Short to voltage on the sensor signal or reference wire
  • Poor or missing ground at the pump control module
  • Corroded/loose connector pins or damaged harness near the pump/module
  • Failed internal temperature sensor or failed pump control module
  • Intermittent wiring damage or water intrusion

Symptoms

  • Malfunction indicator lamp (MIL) or transmission-related warning light
  • Reduced or disabled auxiliary/pump operation
  • Transmission or pump derate, reduced performance
  • Possible stored freeze frame and related transmission codes
  • No start or cross-system warnings on some vehicles (rare)

What to check

  • Read freeze frame and related DTCs; record ignition and engine state when set
  • Visually inspect harness and connectors at the pump and control module for damage, corrosion, or contamination
  • Check and clean connector mating faces and pins; ensure tight fit
  • Measure module ground(s) for low resistance to chassis/ battery negative
  • Backprobe sensor signal and reference with scan tool live data and multimeter
  • Compare measured voltages/resistances to expected values

Signal parameters

  • Reference voltage: typically 5 V reference from module (verify with OEM wiring)
  • Expected sensor signal (typical thermistor): 0–5 V depending on temperature; at ambient often ~1–4 V
  • Open/high circuit often reads near reference (close to 5 V) or diagnostic returns 'high' status
  • Typical thermistor resistance at ambient: often ~1 kΩ–10 kΩ (manufacturer specific); resistance falls with rising temperature for NTC sensors
  • Module ground circuit resistance: ideally

Diagnostic algorithm

  1. Verify the DTC and note freeze frame/related codes. Clear the code and see if it returns.
  2. With ignition ON (engine off), backprobe the temperature sensor signal wire at the pump/module. Observe signal voltage with a good ground. If signal is near reference voltage (~5 V) or above spec, suspect open/high or short to Vb.
  3. Measure resistance of the internal sensor circuit if serviceable (module removed or harness disconnected). Compare to ambient resistance spec or look for open circuit (infinite).
  4. Inspect and wiggle harness while monitoring signal for intermittent changes. Repair or replace damaged wiring or connectors.
  5. Verify module ground(s) and power supply (battery voltage present, good fused feed). Repair grounds or power as needed.
  6. If wiring and connectors test good, swap with a known-good module if available or perform module bench diagnostics per OEM procedure.
  7. After repairs, clear codes and perform a road or functional test to confirm the fault does not return and pump operates correctly.
  8. If fault persists and wiring is confirmed good, replace the pump control module or pump assembly per manufacturer procedure.

Likely causes

  • Broken/disconnected sensor signal wire or connector
  • Corroded connector or pin at the pump/module
  • Shorted sensor wire to battery voltage (fused or unfused)
  • Faulty pump control module electronics

Fault status

⚠️ Status
Electric/Auxiliary Transmission Fluid Pump Control Module internal temperature sensor circuit — signal high (open or short to voltage) detected. May disable or limit pump operation until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0C1E P0118 P0119 P0C1A
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