P1804 Code - Transmission 4-Wheel Drive High Indicator Circuit Failure
Quick Answer
P1804 indicates Transmission 4-Wheel Drive High Indicator Circuit Failure. Common causes include Faulty Transmission 4-Wheel Drive High Indicator, Transmission 4-Wheel Drive High Indicator harness is open or shorted, Transmission 4-Wheel Drive High Indicator circuit poor electrical connection. 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
- P1804 indicates Transmission 4-Wheel Drive High Indicator Circuit Failure.
- Common causes
- Common causes include Faulty Transmission 4-Wheel Drive High Indicator, Transmission 4-Wheel Drive High Indicator harness is open or shorted, Transmission 4-Wheel Drive High Indicator circuit poor electrical connection.
- 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 P1804 Description
What are the Possible Causes of the DTC P1804?
- Faulty Transmission 4-Wheel Drive High Indicator
- Transmission 4-Wheel Drive High Indicator harness is open or shorted
- Transmission 4-Wheel Drive High Indicator circuit poor electrical connection
How to Fix the DTC P1804?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1804 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 P1804 code?
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Need Help with the Code?
Get the P1804 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1804 Buick — Ground Control Relay
- P1804 Cadillac — Ground Control Relay
- P1804 Chevrolet — Ground Control Relay
- P1804 Ford — Transmission 4-Wheel Drive High Indicator Circuit Failure
- P1804 GMC — Ground Control Relay
- P1804 Lincoln — Transmission 4-Wheel Drive High Indicator Circuit Failure
- P1804 Mercury — Transmission 4-Wheel Drive High Indicator Circuit Failure
Frequently Asked Questions about P1804 Code
1. What does the OBDII code P1804 mean?
P1804 refers to a Transmission 4-Wheel Drive High Indicator Circuit Failure, indicating an issue with the circuit that controls the 4WD high indicator light.
2. What are the common symptoms of a P1804 code?
Symptoms may include the 4WD high indicator light not illuminating, staying on constantly, or erratic behavior of the light.
3. What causes the P1804 code to trigger?
Common causes include a malfunctioning 4WD position sensor, damaged wiring or connectors, or a faulty instrument cluster.
4. Can driving with a P1804 code cause damage?
The code itself may not directly cause damage, but it could indicate underlying issues with the 4WD system that may lead to drivetrain problems if left unresolved.
5. How is a P1804 code diagnosed?
A technician will use a scan tool to check for the code, inspect the 4WD high indicator circuit, test the position sensor, and check for wiring or connector issues.
6. What repairs are typically needed to fix a P1804 code?
Repairs may include replacing the 4WD position sensor, repairing or replacing damaged wiring, or addressing faults in the instrument cluster.
7. Can I reset the P1804 code without repairs?
Clearing the code without resolving the issue may only temporarily hide the problem, as the code will likely return if the fault persists.
8. How much does it cost to repair a P1804 code?
Costs vary depending on the root cause, but sensor replacements typically range from $100 to $300, while wiring repairs or instrument cluster fixes may cost more.
9. Can a faulty 4WD position sensor cause other problems?
Yes, a faulty sensor can lead to incorrect 4WD engagement, poor drivability, or potential damage to the drivetrain if the system engages improperly.
10. Is a P1804 code specific to certain vehicles?
P1804 is commonly found in vehicles with 4WD systems, such as trucks and SUVs, but the exact diagnosis and repair steps may vary by manufacturer.
Discuss the causes and fixes for P1804 OBDII Code
-
I keep having a gearbox fault warning keep appearing on my screen and have used a diagnistic tool to identify the possible cause but it comes up as a P1804 code, Activated clutch actuator thermal protection fault, I have tried to look this up but not very clear can anybody help me thanks
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Let me check if I can get more information, what model and year is your vehicle?
Link to answer: https://www.autocodes.com/p...
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