Vauxhall ECU error code P1600: diagnosis and solution

Delphi Delco MT35E

ECUs

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Error code P1600 is a common error code that may indicate a problem with the Delphi Delco MT35E engine control unit (ECU) and can lead to various malfunctions. In fact, the error code description is as follows: “Reprogram or Replace Electronic Control Unit (ECU)”. However, in practice, there appear to be various causes for this error code. How to solve this malfunction, you can read in this article!

Which Vauxhall models have error code P1600?

This error code can occur in various Vauxhall models, and in this article we will specifically discuss the following cars that are equipped with the Delphi Delco MT35E ECU:

Vauxhall Astra H (2004 – 2010)
Vauxhall Meriva A (2003 – 2010)
Vauxhall Vectra C (2002 – 2008)
Vauxhall Zafira B (2005 – 2013)

Symptoms of error code P1600

When error code P1600 occurs, the following symptoms may be visible:

Engine malfunction indicator light (MIL) is on: The MIL light comes on on the dashboard
Loss of power: The engine performs less well or responds slowly
Starting problems: The engine starts with difficulty or not at all
CAN bus complaints: Disturbances in the communication between different systems in the car, which can lead to various error messages

Possible causes of error code P1600 in Vauxhall

From experience we know that error code P1600 can have different causes in the car. Pay particular attention to the following points:

Coil: A defective coil can cause problems. Note that imitation coils also often cause malfunctions
Wiring: Check that all wiring makes good contact, especially on the ECU and around the crankshaft position sensor
Earth cable: Check that the earth cable of the battery makes good contact
Power (+) from the battery: A transition resistance can cause problems in the power supply
Starter motor: Also check the starter motor. Worn carbon brushes can cause the voltage to drop, and sparking on the carbon brushes can cause voltage peaks, which can in turn cause error code P1600 and other CAN complaints
Problems with the ECU itself: Wear or internal errors in the ECU can also be responsible for error code P1600

Solution for Vauxhall error code P1600

Proceed step by step to check the possible causes. If the diagnosis shows that the ECU is indeed defective, having the ECU overhauled will in many cases be the solution to the malfunction mentioned. The Delphi Delco MT35E ECU can be repaired to ensure that the symptoms of error code P1600 are resolved. We offer a 2-year warranty on the overhaul, so that you can send your customer on his way again with peace of mind. Do you have any questions? Then our product specialists are of course happy to help you!