B1A29 fault code: what it means

B1A29: SKIM base station mismatch (Compass/Patriot MK). Immobiliser does not match the engine computer; no-start possible. FCA WCM update or reprogramming.

Body · Costly if missed

Usual causes, most likely first

immobiliser/PCM mismatch after module swap
WCM software
WCM fault

B1A29 by make

Jeep

SKIM base station mismatch (Compass/Patriot MK). Immobiliser does not match the engine computer; no-start possible. FCA WCM update or reprogramming.

Usual causes: immobiliser/PCM mismatch after module swap; WCM software; WCM fault

What the repair usually costs

Crankshaft or camshaft position sensor replaceNZ$100–NZ$590 · A$100–A$580

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Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.