Vehicle Overspeed Condition Detected
The P0297 code indicates that the vehicle's speed has exceeded a predetermined threshold set by the manufacturer, typically above 120 mph. This is often triggered by the engine control module (ECM) when it detects wheel speed sensor readings that surpass the calibrated limit. It can be caused by a malfunctioning speed sensor, a stuck throttle, or even driving at excessive speeds. The code may also appear if the vehicle was on a jack or dyno with wheels spinning freely.
1. Most Common Causes
- Faulty wheel speed sensor
- Stuck throttle or cruise control issue
- Driving at excessive speed
- Wheel speed sensor wiring or connector damage
- ECM software glitch
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Speedometer may be inaccurate
- Vehicle may enter limp mode or reduce power
- Cruise control may not engage
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect wheel speed sensors and wiring for damage or debris.
Step 3: Test wheel speed sensor resistance and AC output while spinning wheel.
Step 4: Check for any aftermarket modifications that could affect speed readings.
Step 5: Clear code and test drive to see if it returns.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe if the code was triggered by a brief overspeed event, but if the cause is a stuck throttle or sensor issue, it could be dangerous. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and sensor replacement if needed. If the issue is a stuck throttle, costs may be higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.