The PACCAR MX P113B page of the 2013 PACCAR MX Diagnostic Service Manual is the manufacturer reference for diagnostic trouble code P113B, described in the manual as “Lambda sensor controller – Incorrect”. It is a 6-page PDF section covering lambda sensor controller 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 | P113B |
| Subject | Lambda sensor controller |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What PACCAR MX P113B means
The manual files P113B as a 1 trip MIL code with 3 drive cycle recovery, readiness group EGS heater and freeze frame type Exhaust gas. The diagnostic runs continuously when the engine is running. The code sets when the PCI ECU (D420) detects that the lambda sensor heater controller inside the PCI ECU is malfunctioning, and it changes to inactive when the fault is no longer detected.
Possible causes and technical data
- Faulty lambda sensor
- ECU connections are damaged or disconnected
Technical data still walks through the component check on lambda sensor (F834), the 2.4-4.0 Ω heater element resistance at 20°C [68°F] and the harness measurements taken on the PCI ECU (D420) side before any control unit is condemned. The page then runs 4 numbered troubleshooting steps, each with its own step ID, starting from a visual inspection of connectors and harness with the ignition off. The manual warns against back probing, notes that disconnecting the EAS connectors during troubleshooting produces multiple errors, and reminds the technician to exit the fault code menu in DAVIE and rerun the test before judging whether anything changed.
Who needs this PACCAR MX P113B 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 P113B extract from the 2013 PACCAR MX Diagnostic Service Manual is filed in the DiagTechPro manuals library, where the 6-page PDF can be viewed or downloaded with a free account.
Related manuals library
