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C1851 Honda Code - Rear Differential Pump Motor

- Code Popularity: 7,197 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC C1851 Honda?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Rear Differential Pump Motor
  • Rear Differential Pump Motor harness is open or shorted
  • Rear Differential Pump Motor circuit poor electrical connection
  • Faulty AWD Control Unit
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How to Fix the DTC C1851 Honda?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

DTC C1851-1E: Rear Differential Pump Motor Circuit High Current
DTC C1851-18: Rear Differential Pump Motor Circuit Low Current
DTC C1851-19: Control Module Internal Control Module Malfunction

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1851 Honda code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

Code C1851 Honda Description

The AWD Control Unit monitors the Rear Differential Pump Motor. The AWD Control Unit sets the OBDII code when the Rear Differential Pump Motor is not to factory specifications.

OBDII Code C1851 Honda - Rear Differential Pump Motor - AutoCodes.com
C1851 Honda Code - Rear Differential Pump Motor

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Code C1851 Honda comments

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