Plymouth Belvedere B1805 Engine Trouble Code
What is Plymouth Belvedere B1805?
Plymouth Belvedere B1805 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
B1805 on the Plymouth Belvedere
Independent workshop data shows that Plymouth Belvedere vehicles with B1805 resolve approximately 40% of cases after a throttle body cleaning and idle relearn procedure. This is always the recommended first step before investing in new sensors.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Plymouth Belvedere |
| Brand: | Plymouth |
| Model: | Belvedere |
| Code: | B1805 |
B1805 Plymouth Belvedere Symptoms
Check Engine Light
Illuminated Plymouth Belvedere dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Plymouth Belvedere
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Plymouth Belvedere
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 Belvedere B1805
Diagnostic Steps:
Regarding B1805, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on B1805 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Plymouth Belvedere B1805 Repair Cost
ECU software update for the Plymouth Belvedere to resolve the B1805 calibration bug is performed free of charge at a franchised Plymouth dealer under the technical service bulletin programme. Always confirm the ECU part number and current flash version before spending money on 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 Belvedere
Some Plymouth Belvedere models have a known software bug where the PCM flags B1805 after battery disconnection and reconnect. Always perform an ECU adaptation reset and drive cycle before ordering any parts following battery work.
DIY Repair Guide: B1805 on Plymouth Belvedere
The fuel pressure test on the Plymouth Belvedere 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 Belvedere
Transmission fluid degradation on the Plymouth Belvedere directly affects solenoid operation. Replacing ATF at 40,000-mile intervals (rather than the often-quoted 'lifetime fill' recommendation) is the best insurance against shift-solenoid codes including B1805.
Frequently Asked Questions — Plymouth Belvedere B1805
A: Not always. Across model years, Plymouth revised sensor specifications, wiring paths, and ECU calibrations. Always confirm the repair procedure matches your specific vehicle's production year and engine code, as parts and labour times can vary significantly.