How is fault code P0605 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull every stored code and write them all down before you touch anything. P0605 rarely arrives alone, and the codes sitting alongside it often point at the real trigger, a flat battery or a recent failed update 2. Check the battery and charging system properly. A weak battery or a charging fault that lets voltage swing wildly can corrupt the module, and there's no point reflashing onto bad power 3. Look up manufacturer TSBs and recalls for the exact model and year. Several makers have issued software fixes for ECUs that set this code, and a known reflash can save you a fortune 4. Inspect the ECU connectors, the wiring, and especially the ground points for corrosion, green crust, or water. Dry the module out and clean the grounds if you find moisture 5. Attempt a reflash with the correct manufacturer software if an update exists for the car. A clean reprogramme fixes a fair share of these when the hardware is still sound 6. If the module rejects the reflash or the fault stays after a cle

Lack of proper voltage and or ground to the PCM, Defective PCM ROM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull every stored code and write them all down before you touch anything. P0605 rarely arrives alone, and the codes sitting alongside it often point at the real trigger, a flat battery or a recent failed update 2. Check the battery and charging system properly.

PPowertrain
0Generic code
6Computer Output
05Sequence number

What does it mean?

P0605 is a generic OBD II powertrain code that applies to all makes and models of vehicles 1996 and newer. This code means that a control module read only memory error has been detected. The issue may be in the Power Control Module (PCM) or one of the other supporting control modules. Depending on the year, make and model of the vehicle it may incorporate several independent control modules.

Some of the most common examples are the transmission control module, the body control module or fuel injection control module and the anti-lock brake control module. These modules are monitored by the PCM at all levels of vehicle operation and even at idle. The PCM translates these readings and makes adjustments to power inputs to control fuel pressure, shifting and anti-lock brake operation.

OBD II error code P0605 indicates that the PCM has lost the ability to monitor one or more control modules. This means the ability to adjust the control module for the automobile to operate correctly has been disabled. Other control modules may be incorporated to support additional features such as a turbocharger, traction control and cruise control. As technology advances, driver-assist features increase and the list of control modules required continues to grow.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.