P062F

What it means

P062F is the generic code for an internal control module EEPROM error. The module checks the non-volatile memory that holds learned values, calibration data and configuration settings. When a read, write or checksum test fails, the code is set. The fault is usually inside the module, though a poor supply or earth can sometimes trigger it.

Symptoms

• Engine warning light on
• Engine cranks but is hard to start or will not start
• Poor idle or rough running
• Reduced power or limp mode
• Learned values such as idle or fuel trims reset repeatedly
• Other modules may show communication faults or the code returns after clearing

Possible causes

• Internal fault in the engine control module memory (EEPROM)likely
• Low battery voltage or voltage dips during cranking or module shutdown corrupting stored datapossible
• Poor power supply or earth connections to the control modulepossible
• Corrupted or outdated software or calibration in the modulepossible
• Failed or interrupted programming or coding of the modulepossible
• Water ingress, corrosion or heat damage inside the modulerare
• Wiring or connector damage causing intermittent module resetsrare

How to diagnose

1. Read all stored codes and freeze frame data, noting whether the code is current or stored and whether other module or voltage codes are present.
2. Check battery condition and charging voltage, and test for voltage drops during cranking.
3. Inspect the control module connectors, power feeds, fuses and earth points for corrosion, looseness or damage.
4. Check the module casing and connector for signs of water ingress, overheating or physical damage.
5. Clear the code, then road test and rescan to see if it returns straight away or only after a power cycle.
6. Check the manufacturer's service information for software updates or known issues for this model and engine.
7. Check for recent module programming, coding or battery disconnection that could have been interrupted.
8. If the code returns with good power and earths, confirm the module fault using the manufacturer's procedure before replacing it.

How to fix

• Repair or replace the battery or charging system if voltage is low or unstable.
• Clean, repair or replace faulty power supply, earth wires or connectors to the module.
• Update or reflash the module software to the latest manufacturer calibration if an outdated or corrupt one is the cause.
• Repeat any failed programming or coding using the correct procedure and a stable power supply.
• Repair any water ingress source and replace the module if it is damaged.
• Replace the control module if the internal memory fault is confirmed, then program and code it to the vehicle.

Can I keep driving?

Nearby codes

• P062EGenericFuel Injector Driver Circuit Performance Bank 2
• P0630GenericVIN Not Programmed or Incompatible - ECM/PCM