B3055 on 2007-2009 Pontiac Torrent: No Start, Security Light Causes and Fixes

What's Unique About the 2007-2009 Pontiac TORRENT

The Pontiac Torrent and its direct sibling, the Chevrolet Equinox, from this era use GM's Pass-Key III (PK3) immobilizer system. This system is known for issues related to the ignition components. Unlike newer push-button start systems where a dead key fob battery is a common cause, the B3055 code on the Torrent is more frequently traced back to physical wear and tear on the key itself or the ignition lock cylinder that reads it. An official GM Technical Service Bulletin (TSB PIC5650M) acknowledges intermittent no-crank conditions related to this system across many GM vehicles. For the 2007-2009 models, the security functions are managed by a dedicated Theft Deterrent Module (TDM), whereas on 2010 and newer models, this function was integrated into the Body Control Module (BCM).

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Engine will not crank when the key is turned
• Engine starts briefly and then immediately stalls
• Security light is illuminated or flashing on the dashboard.
• "Service Theft System" message may appear on the driver information center.
• Key may be difficult to turn or feel worn in the ignition.

Most Likely Causes

1. Damaged or Worn Ignition Key 🔴 High Probability The transponder chip is embedded in the head of the key. Physical damage from being dropped, a broken key blade, or internal failure of the chip can prevent it from communicating. Over time, the metal key can wear down, causing a sloppy fit in the lock cylinder, which also affects the transponder's alignment with the reader coil.
   How to confirm: Try starting the vehicle with a spare key. If the spare key works consistently, the original key is faulty. A technician on Reddit noted a B3055 was caused by a physically broken key, which was was obvious, but even a heavily worn key can be the culprit. A scan tool may also show the key as 'Not Present'.
   Typical fix: Replace the faulty key. A new key must be cut to the vehicle's VIN by a dealer or locksmith and then programmed to the vehicle. This is often the cheapest first step before replacing more expensive hardware.
   Est. part cost: $50-$150
2. Faulty Ignition Lock Cylinder / Housing 🟡 Medium Probability The exciter coil (transponder antenna) that energizes and reads the key chip is part of the ignition lock cylinder assembly. This component or its wiring can fail over time, leading to intermittent signal loss. This is a very common failure point on the Torrent and its platform mates.
   How to confirm: If multiple known-good keys fail to start the vehicle, and RF interference is ruled out, the issue is likely with the reader in the steering column. A technician can test the circuit between the lock cylinder and the Theft Deterrent Module (TDM). Often, this is diagnosed by exclusion after trying new keys.
   Typical fix: Replace the ignition lock cylinder and perform the key relearn procedure. This often resolves the issue.
   Est. part cost: $100-$250
3. Low Battery Voltage ⚪ Low Probability Low system voltage during cranking can cause communication errors between modules, including the TDM, which can falsely trigger a B3055 code. A technician on a forum noted a B3055 was accompanied by a battery reading of only 10.5V.
   How to confirm: Test the vehicle's battery. A healthy battery should have at least 12.4 volts at rest. If the voltage drops significantly during a crank attempt, the battery is weak or failing.
   Typical fix: Charge or replace the vehicle's battery. It is recommended to have a battery charger connected during any key relearn procedure to ensure stable voltage.
   Est. part cost: $150-$250

Rare But Worth Checking

• Radio Frequency (RF) Interference: Other electronic devices on the keychain (like other car keys, fobs, or access cards) or even aftermarket devices inside the car (like phone chargers or LED lights) can sometimes interfere with the 125 kHz signal between the key and the vehicle's reader. TSB PIC5650K provides a long list of potential sources. Try starting the car with only the Torrent key present and other electronics unplugged.
• Faulty Body Control Module (BCM): While less common, the BCM itself (which contains the Theft Deterrent Module) can fail. This is usually the last item to suspect after all other causes have been ruled out. TSB #PIC5650M mentions this as a possibility. Replacement requires programming by a dealer or qualified shop.
• Poor Connection at Ignition Lock Cylinder: The wiring connector to the ignition lock cylinder housing can become loose or corroded, causing an intermittent connection for the exciter coil. A visual inspection and cleaning with electrical contact cleaner can sometimes resolve the issue without replacing parts.

Diagnosis Steps

1. Check for a solid or flashing security light on the dashboard. This confirms an active anti-theft issue.
2. Try starting the vehicle with a known-good spare key. If it starts, the primary key is the problem.
3. Remove any other keys or electronic fobs from the keychain to eliminate potential radio frequency interference.
4. Check the vehicle's main battery to ensure it has a full charge (12.4V+). A low battery can cause false codes.
5. If the vehicle still won't start, attempt the '30-Minute Key Relearn' procedure: Turn the key to the 'ON' position (do not start) and leave it for approximately 10-11 minutes until the security light turns off. Turn the key off for 10 seconds. Repeat this process two more times for a total of three cycles. After the third cycle, try to start the engine.
6. If the relearn procedure fails, use a professional scan tool to read codes from the Body Control Module (BCM) and monitor the transponder key data. The parameter should read 'Present' for a valid key.
7. Based on scan tool data, inspect the wiring and connectors between the ignition lock cylinder and the BCM for any damage or corrosion.
8. If the key and wiring are good, the ignition lock cylinder/housing is the most likely failed component.

Parts You'll Likely Need

• Ignition Key with Transponder (OEM #GM P/N: 15905900 (Key Blank, verify by VIN)) — The transponder chip inside the key head is a common point of failure, either from physical damage or internal fault. A worn key blade can also cause issues.
  Trusted brands: ACDelco, Strattec
  OEM price range: $70-$120
  Aftermarket price range: $40-$80
• Ignition Lock Cylinder with Housing (OEM #ACDelco 25832354 (Replaces 15822350)) — This assembly contains the antenna (exciter coil) that reads the key. If multiple keys won't work, this part has likely failed. This is a very common repair for this platform.
  Trusted brands: ACDelco, Dorman (P/N: 924-719), Standard Motor Products
  OEM price range: $160-$280
  Aftermarket price range: $80-$180

Related Codes That Often Appear With This One

• B3060 — This code, 'Unprogrammed Transponder Key' or 'Unlearned Key Detected', often appears with B3055 when there's a key communication issue or a programming failure.
• B3935 — This code relates to 'Transponder Authentication Error' and points to the same family of security system problems, often being set at the same time as B3055.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M (and its revisions up to PIC5650K): Mentions B3055 in the context of an intermittent no crank, no start, or start/stall concern with the security light on, and points to Radio Frequency Interference (RFI) from aftermarket devices as a primary cause to investigate.
• PIT5030E: Explains a specific cause for B3055 related to flip-keys not being fully extended, relevant to the Torrent's platform siblings and a good practice for all GM flip keys.

Platform-Specific Known Issues

• A known issue on some GM vehicles with flip-style keys is that if the key is not fully extended and locked straight, it can cause an intermittent no-crank and set a B3055. TSB PIT5030E addresses this. Ensure the key is fully locked in the straight position before inserting it into the ignition.
• The Pontiac Torrent is also known for a separate issue where the key can become stuck in the ignition cylinder due to a faulty shifter interlock solenoid, which can sometimes be related to the same general area of the steering column. While not directly causing B3055, it points to general wear and tear in this area.

Mechanic-Grade Diagnostic Values

• Scan Tool Live Data: TDM Transponder Key Parameter — expected: Present. Failure: The parameter reads 'Not Present' when a known-good key is in the ignition and turned to the ON position.
• Ignition Lock Cylinder Exciter Coil Resistance (Ohms) — expected: Not Applicable. Failure: This test is not valid for the Pass-Key III system. Unlike older VATS/Passlock systems that use a resistor pellet in the key, Pass-Key III uses RFID technology. Diagnosis is performed by checking for a signal via a scan tool, not by measuring resistance of the coil.

Scan Tool Commands That Help

• Tech2 / GDS2 or equivalent: Immobilizer Data List > Transponder Key Parameter — This is the primary diagnostic step to confirm if the Theft Deterrent Module (TDM) is successfully reading any key. If it reads 'Not Present' for all keys, the issue is likely the reader (ignition lock cylinder) or the TDM itself.
• Tech2 / GDS2 or equivalent: BCM/TDM Programming/Setup — This function is required after replacing the Theft Deterrent Module (TDM) or Body Control Module (BCM). It programs the vehicle's security information into the new module so it can communicate with the other components and learn the vehicle's keys.

Wiring & Ground Locations

• Body Control Module (BCM) — Located in the center of the dashboard, behind the radio and HVAC control module.. The BCM is the central hub for the body electronics and communicates with the Theft Deterrent Module (TDM). While the TDM reads the key, the BCM is involved in the decision to enable or disable the engine start.
• Theft Deterrent Module (TDM) — The TDM is integrated with the ignition lock cylinder housing in the steering column. It contains the exciter coil (antenna) that reads the key.. This is the primary module responsible for energizing and reading the key's transponder chip. A failure of the TDM or its integrated antenna is a direct cause of code B3055.

Real Owner Repair Stories

• ADD AUTOMOBILE SERVICES YouTube Channel (2013 Chevy Equinox (similar GM Pass-Key III+ system)) — Intermittent no-start with security light on and DTC B3055. The vehicle would sometimes start and other times fail to crank.
  ❌ Tried (didn't work) Simply re-trying to start the car would sometimes work, indicating an intermittent fault.
  ✅ What actually fixed it The technician diagnosed an intermittent failure of the original key's transponder chip. Using a VVDI key tool, he cloned the data from the failing key onto a new 'super chip' and placed it inside the key fob. This resolved the intermittent communication loss and fixed the no-start condition.

OEM Part Supersession History

• 15822350, 12458191, 12533953, 19168637 → ACDelco 25832354 — Part has been updated or consolidated by the manufacturer over time.
  Heads up: The aftermarket equivalent is commonly Dorman 924-719. When sourcing a replacement, using the latest OEM part number (25832354) or a cross-referenced aftermarket part is recommended to ensure compatibility.

Model Year Variations Within This Range

• 2007-2009: On these model years, the Pontiac Torrent uses a separate Theft Deterrent Module (TDM) that is part of the ignition lock cylinder assembly to read the key.
• 2010+: On the second-generation platform (2010+ Chevrolet Equinox/GMC Terrain), the TDM function was integrated directly into the Body Control Module (BCM). While the code's meaning is the same, the physical module being diagnosed is different.