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Home / DTC / U042C — Invalid Data Received From Chassis Control Module B

U042C — Invalid Data Received From Chassis Control Module B

Detailed page for trouble code U042C.

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Code

U042C

Generic U — Network/User

Invalid Data Received From Chassis Control Module B

Brand: Generic
Type: U — Network/User
Views: UK: 9 EN: 18 RU: 11
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Page language: EN

Causes

  • Corroded, loose, or damaged wiring or connector between modules
  • Faulty Chassis Control Module B (internal electronics or firmware)
  • CAN/LIN bus fault (open, short to battery/ground, high resistance, missing termination)
  • Low battery voltage or poor ground affecting module operation
  • Intermittent connection (pin pushed out, water intrusion)
  • Software mismatch or missing calibration (module needs reflash)

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lights illuminated
  • Loss or intermittent operation of functions controlled by Chassis Control Module B (ABS, stability, suspension features depending on vehicle)
  • Erratic instrument cluster readouts or frozen values for parameters from module B
  • Other network communication DTCs present (U0xxx codes)
  • Possible reduced performance or limp mode if critical data is unavailable

What to check

  • Read all stored and pending DTCs and freeze frame with a capable scan tool; note related U-codes and module ID
  • Verify battery voltage (should be ~12.6 V at rest, >11 V while cranking) and inspect charging system
  • Visually inspect connectors and wiring to Chassis Control Module B for corrosion, bent pins, or water intrusion
  • Check module power and ground circuits for proper voltage and low resistance to chassis ground
  • Scan for other modules reporting communication loss or invalid data
  • Measure CAN bus voltages at multiple nodes with a multimeter (see signal parameters) and check termination resistance (~60 ohm across CAN_H and CAN_L with network powered)

Signal parameters

  • Typical CAN differential idle (recessive): ~0 V differential; common-mode ~2.5 V (CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V)
  • Typical CAN dominant differential: ~2.0 V (example: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V)
  • Bus termination: two 120 ohm resistors (one at each end) — measured across CAN_H and CAN_L ≈ 60 ohms with network powered
  • Common bus speeds: 125 kbps, 250 kbps, 500 kbps (verify vehicle-specific rate)
  • Expected message rates vary by signal (wheel speed often 10–100 Hz, status messages 1–20 Hz); module B should transmit its key messages at manufacturer-specified intervals

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data; record module address and time stamp. Note other communication-related codes.
  2. Verify battery and charging system; charge battery to normal level before further testing.
  3. Inspect physically all connectors and harness sections between the affected module and the network backbone. Repair any corrosion or damage.
  4. Confirm module B has proper supply voltage and a good ground at the pins. Repair power/ground wiring if out of tolerance.
  5. With ignition on, measure CAN_H and CAN_L at the module connector and at a known good node. Check for correct idle voltages and proper termination resistance across the bus.
  6. Use a scan tool or scope to monitor CAN traffic. Confirm that module B is transmitting expected frames. Look for malformed frames, time gaps, or collisions.
  7. If bus fault is localized, disconnect suspect branches or non-essential modules one at a time to isolate the faulty node.
  8. If wiring and bus are good but invalid data persists, check for software updates or calibration for Chassis Control Module B and the receiving module; perform reflash if recommended by manufacturer.
  9. If module B is not transmitting or continues to send invalid data after wiring and software checks, consider replacement of Chassis Control Module B. Reprogram/configure new module per vehicle procedures.
  10. Clear codes and road-test to verify repair. Monitor for recurrence and document observed conditions.

Likely causes

  • Damaged or corroded connector/wiring on CAN bus to Chassis Control Module B
  • Faulty CAN transceiver or internal failure in Chassis Control Module B
  • Poor battery/ground causing module to send corrupted data
  • Missing/incorrect termination resistor on the CAN bus or high bus resistance

Fault status

⚠️ Status
Invalid data received from Chassis Control Module B — receiving module detected out-of-range or corrupted network messages from the chassis control unit. Communication integrity failure flagged.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0121 U0416 U0420 U0155
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