Lippert ABS Codes & Sensor Gap
- Identify Lippert-specific ABS trouble codes 068Ah and 0006h.
- Perform the Lippert diagnostic procedure to repair indicated circuits.
- Set wheel-speed sensors within the specified air gap range to the tone ring.
- Feeler gauges — Measure the air gap between the wheel-speed sensor and the tone ring to ensure it is within 1.00–1.75 mm.
- Lippert diagnostic tool — Read DTC 068Ah and 0006h as called out in the program spec.
- Hand tools — Adjust sensor positioning and repair circuits indicated by the diagnostic procedure.
Wheel-speed sensors must be set within the specified air gap to the tone ring.
DTC 068Ah and 0006h are the Lippert ABS codes called out in the program spec; read them with the Lippert diagnostic procedure and repair the circuit indicated.
How It Works
Sensor to Tone Ring Relationship
Wheel-speed sensors must be set within a specific air gap relative to the tone ring to ensure accurate signal generation. If the gap is outside the 1.00–1.75 mm range, the ABS system may fail to process wheel speed correctly.
Lippert Specific DTCs
The system utilizes specific diagnostic trouble codes, specifically 068Ah and 0006h, to identify faults. These codes are retrieved using the Lippert diagnostic procedure to pinpoint the necessary circuit repairs.
Circuit Integrity
Once a code is identified, the technician must follow the diagnostic procedure to repair the specific circuit indicated. This ensures the ABS module receives proper data from the wheel-speed sensors.
Lippert ABS
| Sensor air gap | 1.00–1.75 mm |
| Codes in program | 068Ah, 0006h |
Diagnostic Chart
| Symptom | Check | Spec / Expected | Likely cause & fix |
|---|---|---|---|
| ABS fault light active with code 068Ah or 0006h present. | Perform the Lippert diagnostic procedure to identify the fault location. | 068Ah, 0006h | A fault exists within the circuit indicated by the specific Lippert ABS code. Basis: TrailerPro Academy program spec (customer-provided) |
| Erratic wheel speed signal or sensor-related fault code. | Measure the distance between the wheel-speed sensor and the tone ring. | 1.00–1.75 mm | The sensor air gap is set outside of the specified tolerance. Basis: TrailerPro Academy program spec (customer-provided) |
| Circuit indicated as open or shorted during diagnostic procedure. | Inspect and repair the wiring and connections for the circuit identified by the DTC. | Per the applicable manual | Wiring damage or connector failure within the ABS sensor circuit. Basis: General shop practice |
At the Bay: Diagnose the Case
CASE 1 / 3
ABS fault light active with code 068Ah or 0006h present.
- Test
- Compare
- Correct
Select the next check
Basis: TrailerPro Academy program spec (customer-provided). A likely cause is a hypothesis; confirm it with the applicable service procedure before repair.
Common Bay Mistakes
- ✕ Setting the sensor air gap tighter than 1.00 mm.
- ✕ Attempting to read codes without using the Lippert-specific diagnostic procedure.
- ✕ Ignoring codes 068Ah and 0006h when they appear in the program spec.
- ✕ Replacing sensors before verifying the air gap to the tone ring.
Quick Check
Practice only — not scored.
Hands-on: Shop Test Equipment
Dial Indicator — Bearing End Play
Magnetic-base dial indicator (0.001 in) on the hub face, spindle nut adjustment
🛠 Equip your bay for this test →Symptom: Bearing service — set end play after repack.
Spec limits used
- 0.001–0.010 in — Allowable end play, double-nut wheel end (Dexter 9-15K service manual, p.64)
- 0.008 in — Nev-R-Lube 50 mm max axial end play (Dexter 059-831-00)
- illustrative only — Face runout limit (General shop practice)
Simulated readings for practice. Always follow the manufacturer's procedure and values on a real trailer.
Source: TrailerPro Academy program spec (customer-provided)