B1B00 on Jeep: How to Diagnose & Fix
Driver Airbag Squib 1 Circuit Low
1 Jeep model · 1 documented issue · $150-$600 repair
B1B00 on Jeep by model: symptoms, diagnosis and fix
MP Compasses with engine Stop/Start carry a small auxiliary battery in addition to the main battery. When the auxiliary battery degrades - which owners commonly report at 2-4 years - it back-drains the main battery while the vehicle sits, leaving the Compass dead after a few days despite a new main battery, alternator and starter. The first warning is usually the Stop/Start Not Available message or a Stop/Start warning light, followed by intermittent no-crank, flickering dash lights and spurious module faults. Replacing only the main battery is the classic misdiagnosis; the pair must be healthy and both must be registered/relearned so the charging strategy is correct.
Common Symptoms
- Battery dead after the vehicle sits two or three days
- Stop/Start Not Available message or warning light
- Intermittent no-crank or slow crank with a new battery
- Multiple unrelated warning lights on the dash
- Repeat battery replacements that do not fix the problem
How to Fix
Measure parasitic draw with the vehicle asleep (anything sustained above roughly 50 mA is suspect) and load-test both batteries. Replace the auxiliary AGM battery (located under the front fender/near the airbox depending on year) together with a weak main battery, use the correct AGM specification, and register the new battery with a scan tool so the IBS/charging algorithm relearns. Also inspect the auxiliary battery cable and its ground for corrosion, a common secondary cause of the drain.
What you need to diagnose it
The fix here starts with a test, not a part — which repair you need depends on what the test finds.At least one code uses a manufacturer-specific format. No scanner recommendation is shown because family-level coverage cannot prove it can read that code.
UNI-T UT210E Low-Current DC Clamp Meter
1 mA resolution on the 2 A range — a 0.1 A meter reads a 50 mA drain as zero
$40–$70View
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Testing and isolating the fault is DIY work. Replacing or reprogramming a control module is not — most are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Auxiliary stop/start battery (AGM) — 2018-2020OEMBBAUX101ABCross-refDuralast Platinum AGM Auxiliary Battery AUX14 (BCI Group 400, Super Start Platinum AGM Auxiliary Battery AUX14 (Group 400,, Duracell AGM Auxiliary Battery AUX14, Group Size 400$60–$249
This is the small AGM battery that back-drains the main battery when it degrades. Mopar BBAUX101AB is the current number and supersedes BBAUA200AD, BBAUA200AC, BBAUA200AA, BBAUA180AA and BBAUX101AA — if a dealer or old forum post quotes …
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Sources for this issue (3)
B1B00 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B1B00 mean on a Jeep?
B1B00 stands for "Driver Airbag Squib 1 Circuit Low." The Occupant Restraint Controller (ORC / airbag control module) continuously measures the resistance of the driver frontal airbag squib 1 (initiator) circuit. B1B00 sets when that measured resistance falls below the specified window, indicating one or both squib 1 lines are shorted to ground or to each other rather than presenting the normal initiator resistance. The ORC disables airbag deployment on that circuit and illuminates the airbag warning lamp. On Jeep it is documented across 1 model: Compass.
What are the most common causes of B1B00?
The most common causes of B1B00 are: Driver squib 1 line 1 or line 2 circuit shorted to ground, Chafed or pinched clockspring ribbon in the steering column, Failed clockspring assembly, Faulty driver frontal airbag module (inflator initiator), Damaged or corroded connector at the steering wheel or ORC, Failed Occupant Restraint Controller. The specific cause varies by vehicle.
How much does it cost to fix B1B00 on a Jeep?
Published repair estimates on Jeep range from $150 to $600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for B1B00 on a different make?
View B1B00 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.