Definition not reliably documented — this code sits in a range whose stored definitions could not be verified, so confirm it against your manufacturer's official service information before acting on any interpretation
The P2149 code means the vehicle's onboard diagnostic system has detected: Definition not reliably documented — this code sits in a range whose stored definitions could not be verified, so confirm it against your manufacturer's official service information before acting on any interpretation. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Common Symptoms
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
Probable Causes (Ranked by Likelihood)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Step-by-Step Diagnostic Procedure
-
Confirm your exact make, model, and year first — P2149 is manufacturer-specific and can mean different things across brands.
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Read P2149 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Frequently Asked Questions
What does P2149 mean?
P2149 indicates: Throttle/Pedal Position Sensor/Switch B Circuit. The ECM detected an abnormal condition in this sensor circuit.
Is P2149 serious?
Moderate. The vehicle may enter limp mode. Repair promptly.
What should I check first?
Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read sensor data and compare to expected values. Check reference voltage (typically 5V) at the sensor connector.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2149 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.