C1858 Code - Differential Fluid Pressure
Quick Answer
The AWD Control Unit monitors the Differential Fluid Pressure. Common causes include Faulty Differential Solenoid Valve, Faulty Differential Fluid Pressure Sensor, Differential Fluid Pressure Sensor harness is open or shorted. 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
- C1858 indicates Differential Fluid Pressure.
- Common causes
- Common causes include Faulty Differential Solenoid Valve, Faulty Differential Fluid Pressure Sensor, Differential Fluid Pressure Sensor harness is open or shorted.
- 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.
Code C1858 Description
What are the Possible Causes of the DTC C1858?
- Faulty Differential Solenoid Valve
- Faulty Differential Fluid Pressure Sensor
- Differential Fluid Pressure Sensor harness is open or shorted
- Differential Fluid Pressure Sensor circuit poor electrical connection
How to Fix the DTC C1858?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
DTC C1858-73: Differential Fluid Pressure Deviation High
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1858 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the C1858 code?
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Need Help with the Code?
Get the C1858 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C1858 Acura — Differential Fluid Pressure
- C1858 Honda — Differential Fluid Pressure
Frequently Asked Questions about C1858 Code
1. What are the common symptoms of OBDII code C1858 (Differential Fluid Pressure)?
- Common symptoms include erratic shifting, harsh shifting, and abnormal noises coming from the differential area.
2. What are some potential causes of OBDII code C1858?
- Causes may include a malfunctioning differential fluid pressure sensor, a clogged filter, low differential fluid levels, or a faulty wiring connection.
3. How can I diagnose the issue related to OBDII code C1858?
- Diagnosing the problem typically involves checking the differential fluid level, inspecting the sensor and wiring connections, and testing the differential pressure sensor for proper function.
4. Can I continue driving with OBDII code C1858 present?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the differential components and potentially affect the vehicle's drivability.
5. How can I repair OBDII code C1858?
- Repairs may involve replacing the differential fluid pressure sensor, clearing any clogs in the filter, topping up the differential fluid, or fixing any faulty wiring connections.
6. Are there any DIY tips for addressing OBDII code C1858?
- DIY tips may include checking the differential fluid level and condition regularly, ensuring proper maintenance of the differential system, and addressing any leaks promptly.
7. Can OBDII code C1858 be triggered by other underlying issues?
- Yes, this code can sometimes be triggered by issues such as a failing differential component, a malfunctioning transmission, or a problem with the vehicle's computer system.
8. How urgent is it to address OBDII code C1858?
- It is important to address this code promptly to prevent further damage to the differential system and ensure the vehicle operates safely and efficiently.
9. What is the typical cost to repair OBDII code C1858?
- The cost of repairs can vary depending on the exact cause of the code, but it may range from a few hundred to a thousand dollars, including parts and labor.
10. Can OBDII code C1858 be cleared/reset without repairs?
- While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue to prevent it from reoccurring.
Discuss the causes and fixes for C1858 OBDII Code
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