B3033 on Pontiac: How to Diagnose & Fix
Security System Indicates Tamper
2 Pontiac models · 2 documented issues · 1 critical · $100-$550 repair
B3033 on Pontiac by model: symptoms, diagnosis and fix
The Passlock theft-deterrent sensor built into the ignition lock cylinder wears and sends an unstable resistance signal to the body control module, which then interprets a legitimate key as a theft attempt. The system disables the fuel injectors, leaving the car cranking but not starting with the SECURITY light flashing, and the failure typically recurs and worsens until owners are stranded repeatedly. This is one of the most widely documented complaints on the 1999-2005 Grand Am, with a 23+ page Edmunds thread and a RepairPal-confirmed pattern failure.
Common Symptoms
- Engine cranks but won't start
- SECURITY light flashing or stuck on
- Car starts after waiting 10 minutes with key on
- Intermittent no-starts that become more frequent
- Stalling shortly after start-up with security light on
How to Fix
Replace the ignition lock cylinder (which contains the Passlock sensor) and perform the 10-30 minute Passlock relearn procedure. As a stopgap, owners can do the 10-minute relearn (key on, wait for the security light to stop flashing) to start the car; many DIYers permanently bypass the sensor with an inline resistor on the Passlock signal wires.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- ACDelco 19258699 ignition-lock housing with Passlock sensor
Housing/sensor is distinct from the keyed lock cylinder; perform the exact relearn and confirm connector/VIN.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (5)
- 2003 Pontiac Grand Am Passlock Problem, Won't Start And Security Light Is Blinking: 25 Complaintsarticle
- Security light on Pontiac Grand Am — Car Talk Community (2004 Grand Am, Passlock ignition switch failure)forum
- Pontiac Grand Am Security Passlock Problems — Edmunds Car Forums (23+ pages)forum
- No Start Due to Failed Passlock Sensor: Pontiac Grand Am Electrical System — RepairPalarticle
- NHTSA complaints, 2002 Pontiac Grand Am — multiple ODI records for Passlock/security-light no-start (10898347, 10622496, 10503032, 10726457)nhtsa
The 2000-2005 Bonneville uses GM's Passlock II immobilizer, which reads a Hall-effect sensor in the ignition lock cylinder housing rather than a chip in the key. The sensor and its hair-thin wiring at the column degrade, so the BCM sees a bad or missing signal, flashes the Security lamp, and disables the fuel injectors: the engine cranks, fires for a second, then dies, or does not fire at all. It is intermittent and worse in cold weather. Owners on the Pontiac Bonneville Club and GM Forum document the 10-minute relearn ritual (key on, wait until the security light stops flashing, three cycles) as the only way to get home; the earlier 1992-1999 cars used the different PASS-Key II resistor-pellet key and are not covered by this failure mode.
Common Symptoms
- Engine starts then dies after 1-2 seconds
- Security light flashing or steadily lit with no-start
- Cranks but no fuel delivery
- Starts normally after a 10-minute key-on wait
- Intermittent, worse in cold weather
How to Fix
Temporary: perform the 10-minute Passlock relearn (three consecutive 10-minute key-on cycles). Permanent: replace the ignition lock cylinder/Passlock sensor assembly (about $100-200 in parts, plus column disassembly) and perform the relearn; inspect the yellow/black Passlock wiring at the column connector for chafing first. Many owners instead install a Passlock bypass module. No recall.
Sources for this issue (4)
B3033 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 B3033 mean on a Pontiac?
B3033 stands for "Security System Indicates Tamper." B3033 is a vehicle access/anti-theft body code generally defined as the security system indicating a tamper condition. The body or theft-deterrent control module sets this code when it detects an attempted forced entry or an invalid/unauthorized access event, such as a door or ignition input that does not match a valid key/fob authorization. It is informational regarding the security system and usually does not affect drivability, though it may indicate a real tamper attempt or a faulty input. On Pontiac it is documented across 2 models: Grand Am, Bonneville.
What are the most common causes of B3033?
The most common causes of B3033 are: Forced or unauthorized entry attempt detected, Faulty door ajar / lock cylinder tamper switch, Damaged wiring or connector in a security input, Key/immobilizer authentication mismatch, Body/theft-deterrent control module fault, Aftermarket alarm or remote-start interference. The specific cause varies by vehicle.
How much does it cost to fix B3033 on a Pontiac?
Published repair estimates on Pontiac range from $100 to $550 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 B3033 on a different make?
View B3033 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.