C1851 Honda Code - Rear Differential Pump Motor
Quick Answer
The C1851 Honda code indicates a problem with the rear differential pump motor in the vehicle. Common causes include Faulty rear differential pump motor, Electrical issues, such as a damaged wiring harness or connector, Low or contaminated differential fluid. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1851 Honda indicates Rear Differential Pump Motor.
- Common causes
- Common causes include Faulty rear differential pump motor, Electrical issues, such as a damaged wiring harness or connector, Low or contaminated differential fluid.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code C1851 Honda Description
The C1851 Honda code indicates a problem with the rear differential pump motor in the vehicle. The rear differential pump motor is a crucial component of the vehicle's all-wheel-drive system, responsible for transferring power to the rear wheels. This motor is essential for maintaining traction and stability, especially in challenging driving conditions such as slippery or uneven roads.
Common Causes of C1851 Honda
- Faulty rear differential pump motor
- Electrical issues, such as a damaged wiring harness or connector
- Low or contaminated differential fluid
- Mechanical damage to the rear differential system, such as worn-out gears or bearings
- Water or debris entering the rear differential system, causing corrosion and malfunction
Symptoms of C1851 Honda
- Illumination of the AWD warning light on the dashboard
- Difficulty engaging the all-wheel-drive system
- Strange noises coming from the rear of the vehicle, such as grinding or whining
- Vibration or shaking while driving, especially at higher speeds
- Reduced acceleration and overall performance
How to Fix C1851 Honda
- Diagnose the specific cause of the issue by performing a thorough inspection of the rear differential pump motor and related components.
- Replace the faulty rear differential pump motor with a new, high-quality part that meets the manufacturer's specifications.
- Check and replace the differential fluid if necessary, ensuring that the correct type and amount are used.
- Inspect the wiring harness and connectors for any damage or corrosion, repairing or replacing them as needed.
- Test drive the vehicle after the repair to ensure that the issue has been resolved and that the all-wheel-drive system is functioning properly.
Cost to Fix C1851 Honda
The typical repair costs for addressing the C1851 Honda code related to the rear differential pump motor can range from $500 to $1500, including parts and labor. It's important to note that the actual cost may vary depending on the specific make and model of the vehicle, as well as the location and labor rates of the auto repair shop. Additionally, the time required for diagnosis and repair can impact the overall cost, so it's advisable to consult with a professional technician for a more accurate estimate.
Tech Notes for C1851 Honda
DTC C1851-18: Rear Differential Pump Motor Circuit Low Current
DTC C1851-19: Control Module Internal Control Module Malfunction
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Frequently Asked Questions about C1851 Honda Code
1. What are the common symptoms of OBDII code C1851 in a Honda related to the rear differential pump motor?
The common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, difficulty shifting gears, and unusual noises coming from the rear differential area.
2. What are the possible causes of OBDII code C1851 in a Honda indicating a rear differential pump motor issue?
The code C1851 in a Honda can be triggered by a faulty rear differential pump motor, damaged wiring or connectors, low fluid levels in the differential, or a malfunctioning control module.
3. How can I diagnose the OBDII code C1851 in my Honda that points to a problem with the rear differential pump motor?
To diagnose the issue, you can use an OBDII scanner to read the trouble codes, inspect the wiring and connectors for any visible damage, check the fluid levels in the rear differential, and perform a thorough visual inspection of the pump motor.
4. What are some repair tips for fixing OBDII code C1851 in a Honda related to the rear differential pump motor?
Repair tips include replacing the rear differential pump motor if it is faulty, repairing or replacing any damaged wiring or connectors, ensuring proper fluid levels in the differential, and resetting the trouble codes after the repairs are completed.
5. Can I continue driving my Honda with OBDII code C1851 indicating a rear differential pump motor issue?
It is not recommended to continue driving the vehicle with this issue as it can lead to further damage to the rear differential system. It is best to address the problem promptly to avoid potential safety hazards and costly repairs in the future.
6. How much does it typically cost to repair OBDII code C1851 in a Honda related to the rear differential pump motor?
The cost of repairing OBDII code C1851 can vary depending on the extent of the damage and the specific repairs needed. It is advisable to consult with a professional mechanic to get an accurate estimate for the repair.
7. Is it possible to reset the OBDII code C1851 in a Honda without fixing the rear differential pump motor issue?
While you can clear the trouble code temporarily, it is not recommended as the underlying issue with the rear differential pump motor may worsen over time and lead to more significant problems if left unresolved.
8. How often should the rear differential pump motor be inspected in a Honda to prevent OBDII code C1851 from occurring?
It is advisable to include the rear differential pump motor in your regular maintenance schedule and have it inspected during routine service intervals or whenever you notice any symptoms indicating a potential issue.
9. Can a DIY enthusiast with basic automotive knowledge repair OBDII code C1851 in a Honda related to the rear differential pump motor?
While some basic repairs like checking wiring connections or fluid levels can be done by a DIY enthusiast, diagnosing and repairing more complex issues with the rear differential pump motor may require professional expertise to ensure proper resolution.
10. Are there any recalls or service bulletins related to OBDII code C1851 in Honda vehicles regarding the rear differential pump motor?
It is recommended to check with the nearest Honda dealership or visit the official Honda website to inquire about any recalls or service bulletins related to OBDII code C1851 and the rear differential pump motor in your specific vehicle model.
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