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P0607 – Control Module Performance (OBD2)

P0607 means "Control Module Performance". The engine control unit signal is electrically present but implausible: it does not match what the control unit expects for the current operating conditions or from other sensors. This is a performance fault, not a broken wire.

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P0607 quick summary

Fault codeP0607
MeaningControl Module Performance
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityHigh
Can I drive?Depends on symptoms. If the engine runs normally, drive carefully to a workshop; if it stalls, misfires or goes into limp mode, have it recovered.
Repair cost€0 – €1,500

What internal control unit faults mean

These codes mean the engine (or transmission) control unit has detected a fault in its own memory, processor, internal temperature or internal communication.

Control units constantly check themselves: memory checksums, RAM and ROM tests, processor monitoring and internal temperature. If a self-test fails, they store codes such as P0601–P0606, P0613, P0618, P0619 or P0634. Codes P0666–P0669 cover the internal temperature sensor.

An internal fault code does not always mean the control unit is broken. Low or unstable supply voltage, poor grounds, a failed software update or water damage can all cause self-test failures. Some codes can be cleared by reprogramming the latest software.

If the fault is real, the control unit must be repaired or replaced and then programmed and matched to the vehicle (immobilizer, VIN, variant coding).

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 16991 (P0607). Both numbers mean the same fault.

Symptoms of P0607

  • Check Engine light on
  • Engine stalls or will not start
  • Limp mode or erratic running
  • Communication problems with the scan tool
  • Other modules report lost communication

Most common causes of P0607 (most likely first)

Mechanic's Pro Tip

Before condemning a control unit, check the grounds. A corroded engine ground strap is one of the most common reasons for 'internal' control unit faults – and a fraction of the cost.

  1. 1.Engine control unit worn, contaminated or out of calibration

    Most likely

    The signal drifts slowly, so it is still within the electrical limits but wrong.

  2. 2.Mechanical problem in the system the engine control unit measures or controls

    For example a leak, a sticking part or a restriction that really changes the measured value.

  3. 3.High resistance in a connector or ground

    Corrosion causes a voltage drop that shifts the reading.

  4. 4.Low or unstable supply voltage or poor ground

  5. 5.Failed or interrupted software update

  6. 6.Water ingress or corrosion in the control unit

  7. 7.Internal hardware failure

Step-by-step diagnostic guide

  1. 1

    Check battery, supply and grounds

    Measure battery voltage and the supply and ground pins at the control unit under load.

    Multimeter: Voltage drop on the control unit ground: below about 0.1 V.

  2. 2

    Compare live data with expected values

    Read the engine control unit values in live data and compare them with related readings (engine speed, load, temperature or pressure) and with the specification. A value that is electrically fine but wrong for the conditions confirms a performance fault – then check the mechanical side before replacing the part.

  3. 3

    Read codes and clear

    Read all codes, note them and clear. See whether the internal fault returns immediately or only occasionally.

  4. 4

    Check for software updates

    Check whether a software update or technical service bulletin exists for the code.

  5. 5

    Inspect for water damage

    Check the control unit housing and connectors for water or corrosion.

  6. 6

    Repair or replace and program

    If the fault persists, have the unit repaired or replace it and program/match it to the vehicle.

Frequently asked questions

Can I keep driving with P0607?

Depends on symptoms. If the engine runs normally, drive carefully to a workshop; if it stalls, misfires or goes into limp mode, have it recovered.

How much does it cost to fix P0607?

Typical repair costs are 0 € – 1500 €, depending on the cause and the vehicle. The most common fixes are: engine control unit worn, contaminated or out of calibration; mechanical problem in the system the engine control unit measures or controls; high resistance in a connector or ground. Always confirm the cause with the tests above before buying parts.

Does an internal control unit code mean the ECU is dead?

Not always. Supply, ground and software problems cause many of these codes. Check them first.

Can a control unit be repaired?

Often yes. Specialists repair many common control unit faults, which is usually cheaper than a new unit with programming.

What is the difference between P0607 and similar codes?

P0607 belongs to a group of codes for the same component that differ in the type or location of the fault: P0604 – Internal Control Module Random Access Memory (RAM) Error; P0605 – Internal Control Module Read Only Memory (ROM) Error (Module Identification Defined by SAE J1979); P0606 – ECM/PCM Processor Fault; P0613 – TCM Processor; P0618 – Alternative Fuel Control Module KAM Error; P0619 – Alternative Fuel Control Module RAM/ROM Error. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.