P1607Manufacturer-specific code

P1607 Code: Control Module Internal Circuit Malfunction A (Honda)

On Honda and Acura vehicles, the P1607 code means the engine computer found an error in its own internal circuits. The engine may not start or may run poorly. Check power and grounds before you replace anything.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$0 to $1,200
Difficulty
Hard
System
Computer and Outputs
Applies to
Depends on the manufacturer

Common in: Honda

Updated Reviewed by Renzo Chacca

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What the P1607 code means

P1607 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it means, not the generic SAE standard. The most widespread definition is the one used by Honda and Acura. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1607
Honda and AcuraControl module internal circuit malfunction A

Honda sets the P1607 code when the computer detects an error in its own internal circuits.

Before you replace the computer, check the power feeds and grounds and see whether a software update exists, because unstable voltage sets the same code.

Before you start repairs, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1607 code symptoms

  • Check engine light on.
  • The engine may not start or may run poorly.

Likely causes of the P1607 code

  1. Unstable supply voltage. Check the battery and the grounds.
  2. Computer software. This is uncommon, so rule out everything else first.
  3. A real internal failure, once everything else is ruled out.

How to diagnose the P1607 code step by step

  1. Test the battery.
  2. Check the engine grounds.
  3. Look for software updates.

How to fix the P1607 code

  • Repair the power feed and the grounds.
  • Update the software.
  • Replace the computer if the code persists.

Technical reference data

  • A new computer usually needs immobilizer programming.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

Replacing the computer is the last step, not the first. Weak power and bad grounds mimic an internal failure very well, and they cost far less to fix.

P1607 on Honda

Very common on the Civic, Accord, CR-V, Fit and Odyssey.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives this code and confirm it with a compatible scan tool.

Frequently asked questions about P1607

What does the P1607 code mean on a Honda?
It means the computer detected an error in its own internal circuits. The engine may not start or may run poorly.
Does P1607 mean the same thing on every brand?
No. It is a manufacturer-specific code, so on other brands it may not exist or may mean something different. Confirm it with a scan tool that supports your make.
Can I drive with a P1607 code?
With caution. A P1607 code can make the engine run poorly or refuse to start, so be ready for the vehicle to leave you stranded.
How much does it cost to fix P1607?
Roughly $0 to $1,200 on a Honda. Fixing a ground costs almost nothing, while a replacement computer with programming is the top of the range.
Will a P1607 code clear itself?
It might if the cause was a temporary voltage problem. If the computer has a real internal failure, the code returns.
What is the most common cause of P1607?
Unstable supply voltage from the battery or the grounds. A software problem or a real internal failure are less common.

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Questions about the P1607 code

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