The PACCAR MX P1161 page of the 2013 PACCAR MX Diagnostic Service Manual is the manufacturer reference for diagnostic trouble code P1161, described in the manual as “Wheel speed, rear axle, right – Data erratic, intermittent or incorrect”. It is a 4-page PDF section covering wheel speed sensor diagnostics on EPA2013 PACCAR MX engines, and it keeps the same layout as every other code page in that manual.
Document details and coverage
| Brand | PACCAR |
| Model coverage | PACCAR MX engines, EPA2013 emissions |
| System group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P1161 |
| Subject | Wheel speed sensor |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What PACCAR MX P1161 means
The manual files P1161 as a 1 trip MIL code with 3 drive cycle recovery, readiness group None and freeze frame type Comprehensive. The diagnostic runs continuously when the ignition is on. The code sets when the ECU detects that the right rear axle wheel speed sensor reads more than 160 km/h, and it changes to inactive when a normal wheel speed is detected.
Possible causes and technical data
- Issue with excessive air gap in sensor and exciter ring
- Output is low at drive off
- Issue at wheel end with the exciter ring, tooth condition, clamping sleeve, kinked or restricted airline or brake mechanical function
- Erratic sensor signals caused by corroded or damaged wiring
Values come from the OEM technical data. The manual notes that ATC is disabled, that in a four-sensor system ABS on the affected wheel is disabled while the other wheels keep ABS, and that in a six-sensor system ABS stays active using the remaining rear sensor on the same side. Everything on this PACCAR MX P1161 page is reference material rather than a numbered step list, so the technician works from the condition data and the possible causes with DAVIE connected.
Who needs this PACCAR MX P1161 manual page
Heavy-duty technicians, fleet shops and independent workshops diagnosing Kenworth and Peterbilt trucks with EPA2013 PACCAR MX engines use this page to confirm what the ECU actually measured before parts are ordered. For engine literature, dealer locations and support contacts beyond this single code, start at the PACCAR corporate website.
The complete PACCAR MX P1161 extract from the 2013 PACCAR MX Diagnostic Service Manual is filed in the DiagTechPro manuals library, where the 4-page PDF can be viewed or downloaded with a free account.
Related manuals library
