OBD Guide
ENFRDEESPT

P316B

Secondary Fuel System Requests Signal Message Counter Incorrect

P316B is an OBD-II diagnostic trouble code meaning: Secondary Fuel System Requests Signal Message Counter Incorrect. Common causes: engine control module (ecu) malfunction, problems with secondary fuel system wiring or connectors. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • The Check Engine light comes on
  • Reduced engine performance
  • Unstable engine operation at idle
  • Increased fuel consumption
  • Possible problems starting the engine

Causes

  • Engine control module (ECU) malfunction
  • Problems with secondary fuel system wiring or connectors
  • Malfunction of secondary fuel system sensors
  • ECU software problems
  • Incorrect data from other vehicle systems

How to Fix

  1. Check the secondary fuel system wiring and connectors for damage or corrosion.
  2. Check secondary fuel system sensors to manufacturer specifications.
  3. Update the engine control module (ECU) software to the latest version.
  4. Check the ECU for internal faults.
  5. Replace faulty secondary fuel system components.

Related codes

P316AP316CP316D

FAQ

What does the P316B code mean?

P316B is an OBD-II diagnostic trouble code that indicates: Secondary Fuel System Requests Signal Message Counter Incorrect

What causes a P316B error code?

The most common causes of P316B include: Engine control module (ECU) malfunction; Problems with secondary fuel system wiring or connectors; Malfunction of secondary fuel system sensors; ECU software problems.

How do I fix a P316B diagnostic trouble code?

To fix P316B: Check the secondary fuel system wiring and connectors for damage or corrosion.. Check secondary fuel system sensors to manufacturer specifications.. Update the engine control module (ECU) software to the latest version.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P316B?

Yes, but get it checked soon

How much does it cost to fix P316B?

The estimated repair cost for P316B is $22–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat