Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Immobilizer Module (IMM) And Guard Lock And Alarm (GLA) - Diagnostic Trouble Codes (DTC) - 2 Of 2 (Convertible)
2004 Volvo C70 2.4 63SECTION Immobilizer Module (IMM) And Guard Lock And Alarm (GLA) - Diagnostic Trouble Codes (DTC) - 2 Of 2 (Convertible)
- GLA-456 SRS Signal. Signal Too Low. Intermittent Fault (1999-2004)
- GLA-456 SRS Signal. Signal Too Low. Permanent Fault (1999-2004)
- GLA-511 Control Switch. Signal Too Low (1999-2004)
- GLA-512 Control Switch. Signal Too Low (1999-2004)
- GLA-521 Central Locking Switch. Signal Too Low (1999-2004)
- GLA-522 Fuel Tank Filler Cover Control Switch. Signal Too Low (1999-2004)
- GLA-523 Control Switch In Trunk Lid. Signal Too Low (1999-2004)
- GLA-524 Tailgate Control Switch. Signal Too Low (1999-2004)
- GLA-525 Passenger Door Central Locking Switch. Signal Too Low. Intermittent Fault (1999-2004)
- GLA-525 Passenger Door Central Locking Switch. Signal Too Low. Permanent Fault (1999-2004)
- GLA-531 Courtesy Lighting. Signal Too High (1999-2004)
- GLA-541 Ignition Switch. Signal Too Low (1999-2004)
- IMM-112 Control Module, Internal Fault (1999-2004)
- IMM-121 Pin, Cannot Be Programmed (1999-2004)
- IMM-122 Immobilizer Not Initiated (1999-2004)
- IMM-132 No Key Codes Programmed (1999-2004)
- IMM-213 Communication With Engine Control Module (ECM), Faulty Communication (1999-2004)
- IMM-214 Communication From Engine Control Module (ECM), Wrong Min Code (1999-2004)
- IMM-225 Incorrect Programming Of Key Code (1999-2004)
- IMM-233 Antenna Ring, No Connection (1999-2004)
- Diagnostic trouble code (DTC) information
- No connection
- IMM-234 Transponder Communication, No Communication (1999-2004)
- IMM-235 Key Unknown, Not Stored (1999-2004)
- IMM-312 Communication Link To The Engine Control Module (ECM), Short-Circuit To Ground (1999-2004)
- IMM-321 Initiation Signal From Engine Control Module (ECM), Signal Missing (1999-2004)
- Diagnostic trouble code (DTC) information
- Signal missing
- Notes
- Checking engine control module (ECM) type
- Replacing engine control module
- Checking for a short-circuit to supply voltage
- Checking open-circuit/oxidation
- Checking if the fault persists
- Select engine control module (ECM)
- Checking communication with engine control module (ECM) MSA 15.7 and Fenix 5.2
- Checking communication with engine control module (ECM) ME7, DENSO and MSA 15.8
- Replacing immobilizer control module
- Replacing engine control module (ECM)
- Verification
- Information
- IMM-336 VGLA Control Circuit, Faulty Connection To VGLA Control Module (1999-2004)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.