PACCAR DTC 67806 is covered by the “CVSG Supply Open or Shorted” section of the PACCAR Electrical System Service Manual, Section 12, published as PM819010/KM815054 (04/01/2010) and covering manual pages 12-100 to 12-103. The section handles DTC 67805 and DTC 67806 as one open-and-short pair on the gauge supply circuit.
What PACCAR DTC 67806 reports
The listed symptom is that the CVSG (2-inch Commercial Vehicle Smart Gauges) are inoperative. The manual explains that the CVSG supply is daisy chained from one gauge to the next, and the ICU/CECU monitors that supply and issues a trouble code when it is either open or shorted. In the diagnostic table, PACCAR DTC 67806 is the entry where the ICU/CECU has a short to ground on the CVSG power supply circuit.
Document details at a glance
| Brand | PACCAR |
| Model coverage | PACCAR multiplexed cab instrumentation, 2005-2010 |
| System / group | DTCs / Cab (2005-2010) |
| Codes covered | DTC 67805 and DTC 67806 |
| Publication no. | PM819010/KM815054 (04/01/2010) |
| Manual pages | 12-100 to 12-103 |
| PDF pages | 4 |
| File size | 0.2 MB |
| Format / language | PDF, English |
Checks the procedure walks through
As with the rest of Section 12, the routine is built around the Electronic Service Analyst (ESA). The technician connects to the vehicle, uses Monitor to open suspect gauge functions, then uses Diagnose to list active trouble codes before touching a single wire.
- If the gauge graphics on screen display reasonable readings, the manual says there is no active open or short, and points to intermittent causes: a pinched wire, a loose connection, or bent and corroded pins on the CVSG supply circuit.
- Voltage check at Pin 1 of the 9-pin CECU connector A, which decides whether the fault is upstream or downstream of the control unit.
- Continuity from Pin 1 of connector A through the gauge harness, following the daisy chain gauge by gauge.
- Related dimmer and backlight codes documented in the same extract, so the pages cover neighbouring instrumentation faults too.
Who needs this PACCAR DTC 67806 extract
It is aimed at technicians facing a group of dead smart gauges rather than a single failed readout, where the supply chain itself is suspect. Current manufacturer service literature is published through the PACCAR corporate site.
The complete PDF for DTC 67806 is filed in the DiagTechPro manuals library. A free account is required to open the download.
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