P0600 indicates that the ECU has detected an internal communication error on its serial data bus. This means the various control modules inside your vehicle cannot properly exchange vital information, which can affect engine management, transmission shifting, and several other critical safety systems.
DTC/P0600·Ford
P0600 on Ford: Causes, Symptoms and Fix Cost
Quick Answer
High SeverityNot safe to driveFord
P0600 on a Ford indicates that the ECU has detected an internal communication error on its serial data bus. This means the various control modules inside your vehicle cannot properly exchange vital information, which can affect engine management, transmission shifting, and several other critical safety systems.
Repair cost on Ford€36 - €1710
What does P0600 mean on a Ford?
Ford Focus
2005-2022The Focus Mk2 and Mk3 are known for CAN bus issues caused by corroded connectors in the engine bay. Ford TSB 12-6-2 addresses communication faults related to ground point corrosion near the battery tray. Check G100 and G101 ground points.
What causes P0600 on a Ford?
Beyond the generic causes listed on the main P0600 page, these are the Ford-specific patterns we see most often:
Ford FocusCorroded engine bay CAN bus connectors
Ford FocusGround point corrosion near battery tray (G100/G101)
How to diagnose P0600 on a Ford with OBD2
Follow these steps to pinpoint the root cause of P0600:
- Check battery voltage with a multimeter. It should read 12.4V or higher with the engine off and 13.5-14.5V while running. Low voltage is a common cause of serial communication errors.
- Inspect all ECU ground points for corrosion or loose connections. Clean and retighten any suspect grounds.
- Scan for additional DTCs across all modules using a full-system OBD2 scanner. Multiple communication codes point to a CAN bus wiring issue rather than a single module failure.
- Inspect the CAN bus wiring harness for chafing, corrosion, or rodent damage, particularly around the ECU connector and along the firewall.
- If wiring checks pass, attempt an ECU reset by disconnecting the battery for 15 minutes. If the code returns immediately, the ECU likely needs replacement or reprogramming.
How much does P0600 cost to fix on a Ford? (EUR)
Estimated repair costs on a Ford (Ford parts and labour typically run 10% below the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0600 on Ford
These codes commonly cluster with P0600 on Ford vehicles:
FAQ: P0600 on Ford
What does P0600 mean on my car?
P0600 means the engine control unit has detected a failure in its internal serial communication link. The modules inside your car use this data bus to share information, and when it fails, multiple systems can malfunction simultaneously.
Can I drive with a P0600 code?
It is not recommended. P0600 can cause unpredictable engine behaviour including stalling, and may disable safety-critical systems. Have it diagnosed as soon as possible.
Can a weak battery cause P0600?
Yes. Low battery voltage is one of the most common causes of serial communication errors. Always check your battery health and charging system before assuming the ECU is faulty.
How much does it cost to fix P0600?
If the issue is a bad ground or low battery, repairs can cost under 100 EUR. If the ECU itself has failed, expect 550-1900 EUR for replacement and programming at a dealership.
Is P0600 always an ECU failure?
No. While a faulty ECU is the most common cause, wiring problems, poor grounds, and low battery voltage can all trigger P0600. A proper diagnosis should rule out these cheaper fixes first.
Looking for the full P0600 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0600 guideSkanyx · Ford
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