Plymouth Gtx B1805 Engine Trouble Code
What is Plymouth Gtx B1805?
When Plymouth Gtx B1805 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
B1805 on the Plymouth Gtx
On the Plymouth Gtx, a secondary air injection pump that has seized due to moisture ingress is a common trigger for B1805. The fault is usually only present on cold starts and clears itself after two to three warm-up cycles, making it easy to overlook.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Plymouth Gtx |
| Brand: | Plymouth |
| Model: | Gtx |
| Code: | B1805 |
B1805 Plymouth Gtx Symptoms
Check Engine Light
Illuminated Plymouth Gtx dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Plymouth Gtx
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Plymouth Gtx
Increased Emissions
Failed emissions test due to B1805
B1805 Code Structure
Understanding what each digit means in the B1805 body trouble code:
| B | 1 | 8 | 0 | 5 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | Engine Oil Temperature Sensor Malfunction | Cold Start Injector 1 Malfunction | Crankshaft Position Sensor B Circuit Malfunction |
How to Fix Plymouth Gtx B1805
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Gasoline engines use spark plugs to ignite fuel-air mixture. Proper timing ensures the explosion occurs when the piston is positioned correctly. Incorrect plug wire sequencing causes mistimed ignition, resulting in poor performance.
Technical Notes:
B1805 DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
Plymouth Gtx B1805 Repair Cost
Replacing the lambda (O2) sensor wiring loom section on the Plymouth Gtx costs $90–$160 at a body shop or auto-electrician. This is far cheaper than replacing the sensor itself when the sensor is otherwise functional — always inspect wiring before condemning sensors.
B1805 Description
B1805 engine trouble code is related to Crankshaft Position Sensor B Circuit Malfunction.
Main Cause
The primary reason for B1805 OBD-II Engine Trouble Code is: Engine Oil Temperature Sensor Malfunction.
Common B1805 Misdiagnosis on the Plymouth Gtx
A frequent misdiagnosis on the Plymouth Gtx is replacing the oxygen sensor when B1805 appears, only for the code to return within days. The actual cause is usually an exhaust manifold gasket leak introducing false air before the upstream O2 sensor — a much cheaper fix.
DIY Repair Guide: B1805 on Plymouth Gtx
The fuel pressure test on the Plymouth Gtx requires a Schrader-valve type fuel pressure gauge ($25–$40) connected to the fuel rail test port. With the ignition ON (engine off), pressure should hold above 30 PSI for two minutes. A rapid drop confirms a leaking injector or failing regulator as the root cause of B1805.
Preventing B1805 on the Plymouth Gtx
For diesel Plymouth Gtx owners, a DPF (Diesel Particulate Filter) regeneration run on the motorway every 500 miles prevents soot blockage that back-pressures the exhaust and forces B1805 flags via the pressure differential sensors.
Frequently Asked Questions — Plymouth Gtx B1805
A: Yes. Any stored fault code — including B1805 — will cause an automatic failure in most OBD-II based emissions tests. The code must be resolved and the vehicle must complete a full OBD drive cycle with no new codes before the test.