Fault code P1607 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1607 – MIL O/P Circuit Malfunction

P1607: Causes, signs and repairs

Error code P1607 is displayed and the check engine light is on - what does this mean?

The DTC P1607 is recognized by the OBD/EOBD system and indicates a problem with the engine control unit (ECU) or its internal communication. This manufacturer-specific error code mainly occurs in Honda and Acura vehicles and indicates a fault in the ECU's internal data processing or in the memory system.

What can cause this error code?

Defective engine control unit (ECU)
Corrupt software or firmware in the control unit
Faulty internal ECU memory modules
Voltage fluctuations in the power supply
Damaged wiring to the control unit
Loose or corroded plug connections on the ECU
Overheating of the engine control unit
Electromagnetic interference

What symptoms occur in parallel with fault code P1607?

Starting problems: The vehicle is difficult or impossible to start
Irregular idling: Engine runs unevenly or stutters at idle speed
Loss of power: Significantly reduced engine power while driving
Jerking when accelerating: Vehicle reacts delayed to gas pedal pedal
Engine switches off: Sudden shutdown while driving
Electronic system failures: Various vehicle functions operate incorrectly

How can the problem with error code P1607 be rectified?

The repair usually requires professional diagnosis, as it is a complex ECU problem.
Carry out an ECU reset: Disconnect the battery for 30 minutes and reset the control unit, then delete the error code and carry out a test drive
Install software update: Have the latest firmware for the engine control unit installed by the authorized dealer
Check plug connections: Check all cable connections to the ECU for tightness and corrosion, clean or replace if necessary
Test the power supply: Check the on-board voltage and ground connections of the control unit with a multimeter and repair defective cables
Replace the ECU: In the event of irreparable damage, replace the entire engine control unit with a new or overhauled unit and have it programmed
Professional diagnostics: Visit a specialized workshop for detailed ECU analysis with manufacturer-specific diagnostic equipment

FAQ - Frequently asked questions about DTC P1607

Can I continue driving with error code P1607?

Continuing to drive with the code P1607 is not recommended, as the vehicle can stop at any time. The fault code indicates serious ECU problems that can lead to sudden engine failure.

How much does it cost to repair error code P1607?

The repair costs vary greatly: a software update costs around 100-200 euros, while an ECU replacement can cost between 800-2000 euros. The diagnosis usually costs 80-150 euros.

Is error code P1607 a common problem?

In Honda and Acura vehicles of certain model years, the P1607 trouble code occurs relatively frequently, especially in models between 2003-2008. These are often known ECU weaknesses in these vehicles.

Can I repair the P1607 trouble code myself?

Basic steps such as ECU reset or connector check are possible, however most P1607 repairs require professional equipment and ECU programming expertise.

How do I prevent recurrence of P1607?

Regular maintenance, avoiding voltage spikes when jump starting and protection from moisture in the engine compartment can protect the ECU. Software updates should be installed promptly.

What other error codes often occur together with P1607?

The codes P0601, P0602 or P1298 often appear in parallel, as these also indicate internal ECU problems. These fault codes reinforce the diagnosis of a defective engine control unit.

Vehicles in which fault code P1607 occurs most frequently

Fault code P1607 is a manufacturer-specific EOBD code that mainly indicates ECU-internal communication problems and can occur in various vehicle brands, but is most common in the following vehicles:

Honda: Civic, Accord, CR-V, Pilot, Odyssey, Element (2003-2008)
Acura: TL, TSX, MDX, RDX, RSX (2004-2009)
Nissan: Altima, Sentra, Maxima (2002-2006)
Infiniti: G35, FX35, M35 (2003-2007)
Mazda: Mazda3, Mazda6, CX-7 (2004-2008)
Mitsubishi: Lancer, Eclipse, Outlander (2003-2009)
Subaru: Impreza, Legacy, Forester (2005-2008)

If code P1607 occurs in your vehicle, you should first try a simple ECU reset before visiting a workshop. As this DTC often indicates serious ECU problems, a professional diagnosis is usually unavoidable. Particularly in the Honda and Acura models mentioned, these are often known ECU weaknesses, for which there are sometimes goodwill regulations or technical bulletins.

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