P0319 – Rough Road Learned Value means the engine control unit has detected a problem with the stored calibration used to distinguish rough-road vibration from real engine misfires. The ECU uses wheel speed data or accelerometer input to “learn” what normal rough-road vibration looks like. If this learned value becomes corrupted, out of range, or not updated properly, the ECU may store P0319. This guide explains what P0319 means, its symptoms, causes, diagnosis steps, and the most effective repair options.
What Does P0319 Mean?
P0319 is a generic OBD-II code indicating the ECU’s rough-road learned value is missing, invalid, or outside expected limits. This learned value helps the ECU filter out misfire-like crankshaft fluctuations caused by potholes, cobblestones, or off-road terrain. Without a valid learned value, the ECU may incorrectly identify vibrations as misfires or fail to detect real ones.
This code often appears after ABS module replacement, PCM programming, wheel speed sensor issues, or major changes to wheel/tyre size that disrupt learned vibration characteristics.
Quick Reference
- OBD-II Family: P-Code (Powertrain)
- Scope: Generic
- System: Misfire Monitoring / ABS / Rough Road Logic
- Difficulty Level: Moderate
- Estimated Repair Cost: €80–€300+
- Last Updated: 9 December 2025
Real-World Example / Field Notes
A sedan repeatedly stored P0319 after an ABS module replacement. The module had not completed its rough-road recalibration drive cycle. After a 15-minute drive on mixed pavement and performing an ABS initialization, the rough-road value updated correctly and the code cleared.
Another case involved a crossover SUV with upgraded oversized tyres. The ECU’s rough-road learned value no longer matched expected vibration patterns. After reprogramming the ABS module to the new tyre size, P0319 cleared permanently.
Symptoms of P0319 – Rough Road Learned Value
- Check engine light: Usually the primary symptom.
- False misfire codes: The ECU may misinterpret vibrations as engine misfires.
- Unstable misfire monitoring: Misfire counters may behave erratically.
- ABS or traction alerts: Only if wheel speed data is also affected.
- No real drivability issues: The engine typically runs normally.
Common Causes of P0319
Most Common Causes
- ABS module replaced and not initialized
- Rough-road value not learned after PCM or ABS programming
- Faulty or inconsistent wheel speed sensor signals
- Incorrect or mismatched tyre sizes
- Corrupted learned value due to battery voltage drop
Less Common Causes
- Faulty accelerometer or G-sensor (if equipped)
- Damaged wiring to rough-road sensor inputs
- Incorrect software version in PCM or ABS
- Failed ABS/ESC control module
- Chassis vibration abnormalities (bad wheel bearings or suspension issues)
Diagnosis: Step-By-Step Guide
Diagnosing P0319 involves checking the rough-road learning inputs—usually wheel speed signals or accelerometer data—and verifying ABS to PCM communication.
Tools You’ll Need
OBD-II scan tool with ABS access, multimeter, wiring diagrams, programming-capable scan tool, and basic hand tools.
- Check freeze-frame data: Review road speed, ABS status, and misfire counters when the code set.
- Scan the ABS and PCM: Look for wheel speed or G-sensor codes that may cause P0319.
- Check wheel speed live data: All four wheels must report stable and consistent speeds.
- Verify tyre size: Ensure all tyres match and meet OEM specifications.
- Inspect wheel speed sensor wiring: Check for corrosion or damaged connectors.
- Perform ABS initialization: Required after module replacement or programming.
- Check for accelerometer function: Ensure acceleration data is stable and updating.
- Update PCM/ABS software: Install latest calibration or reflash if available.
- Road test on mixed surfaces: Many vehicles require a “rough-road relearn drive cycle.”
- Check battery voltage: Low voltage may corrupt learned values.
Pro Tip: After ABS or PCM replacement, perform a mixed-surface road test (smooth, gravel, and uneven pavement). Many vehicles will relearn rough-road values automatically during this drive cycle.
Possible Fixes & Repair Costs
- Perform ABS/PCM initialization or relearn: €0–€120
- Replace faulty wheel speed sensor: €40–€120
- Repair damaged wiring to sensors: €50–€150
- Reprogram ABS or PCM: €60–€150
- Replace rough-road accelerometer (if equipped): €80–€180
- Replace ABS/ESC module: €150–€300+
Can I Still Drive With P0319?
Yes, the engine usually runs normally. However, misfire detection may be inaccurate, increasing the risk of false misfire codes. In rare cases, ABS or traction control may behave inconsistently if wheel speed data is also affected. Driving is safe short-term but the system should be repaired to restore proper misfire filtering.
Related Codes
- P0399 – Ignition Coil “R” Primary/Secondary Circuit
- P0364 – Reserved
- P0363 – Misfire Detected Fueling Disabled
- P0362 – Ignition Coil “L” Primary/Secondary Circuit
- P0361 – Ignition Coil “K” Primary/Secondary Circuit
- P0360 – Ignition Coil “J” Primary/Secondary Circuit
- P0359 – Ignition Coil “I” Primary/Secondary Circuit
- P0358 – Ignition Coil “H” Primary/Secondary Circuit
- P0357 – Ignition Coil “G” Primary/Secondary Circuit
- P0356 – Ignition Coil “F” Primary/Secondary Circuit
Key Takeaways
- P0319 means the ECU’s rough-road learned value is invalid or missing.
- ABS initialization or a relearn drive cycle often resolves the issue.
- Wheel speed sensor faults are the most common underlying cause.
- Driving is safe, but misfire detection accuracy is reduced.
FAQ
What is the rough-road learned value?
It is data stored by the ECU that helps it distinguish real misfires from vibrations caused by uneven road surfaces.
Does P0319 mean the engine is misfiring?
No. It means the system that filters out false misfires is not functioning correctly.
Can mismatched tyres set P0319?
Yes. Different tyre sizes disrupt wheel speed data and confuse rough-road logic.
Does P0319 clear on its own?
Sometimes. After a proper relearn drive cycle, the ECU may update the value automatically.
Do I need to replace any sensors?
Only if diagnostics show a faulty wheel speed sensor, accelerometer, or ABS module. Many repairs require only a relearn or programming update.