OBD Guide
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P1598

Power Take Off Engine Speed Request Signal Message Counter Incorrect

P1598 is an OBD-II diagnostic trouble code meaning: Power Take Off Engine Speed Request Signal Message Counter Incorrect. Common causes: pto speed sensor malfunction, damaged pto wiring harness. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Unstable engine operation
  • Problems with PTO activation
  • Intermittent operation of additional equipment

Causes

  • PTO speed sensor malfunction
  • Damaged PTO wiring harness
  • Contact corrosion in PTO circuit
  • PTO module malfunctions
  • ECU software problems

How to Fix

  1. Check the integrity of the PTO wiring harness
  2. Clean contacts in PTO connectors
  3. Check PTO speed sensor
  4. Test the PTO module
  5. Update ECU software

Related codes

P1597P1599P1600

Error P1598 by Vehicle Brand

DodgeJeepPlymouthPontiac

FAQ

What does the P1598 code mean?

P1598 is an OBD-II diagnostic trouble code that indicates: Power Take Off Engine Speed Request Signal Message Counter Incorrect

What causes a P1598 error code?

The most common causes of P1598 include: PTO speed sensor malfunction; Damaged PTO wiring harness; Contact corrosion in PTO circuit; PTO module malfunctions.

How do I fix a P1598 diagnostic trouble code?

To fix P1598: Check the integrity of the PTO wiring harness. Clean contacts in PTO connectors. Check PTO speed sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1598?

Yes, but get it checked soon

How much does it cost to fix P1598?

The estimated repair cost for P1598 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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