GM uses a family of “UQ” RPO codes to identify a vehicle’s factory audio system. The codes split into three tiers:
Base audio (no external amplifier) – UQ3 — Standard base speakers, older GMT900-era code. – UQ5 — Step-up base speakers, no external amplifier. – UQF — Standard Audio. GM’s official definition: “Speaker System Standard Audio.”
Mid-tier enhanced audio (with amplifier, not Bose) – UQG — Enhanced Audio with Amplifier. Has a non-Bose amplifier in the audio path.
Bose premium audio – UQA — Speaker System Premium Audio (Bose) with Amplifier. The most common Bose configuration on GMT900 and K2XX SUVs. – UQS — Speaker System Premium Audio (Bose) with Surround Amplifier. Includes surround sound processing. – UQH — Speaker System Premium Audio Branded (Bose) with Surround Amplifier, Audiophile. Top-tier Bose. Common on Corvette.
Why this matters for module replacement:
When ordering a replacement radio (ACM) from WAMS or anywhere else, you must match the original audio configuration:
- Base audio (UQ3/UQ5/UQF) → requires the base ACM variant
- Enhanced audio (UQG) → requires the matched ACM
- Bose audio (UQA/UQS/UQH) → requires the Bose ACM variant
Installing a base ACM in a Bose-equipped vehicle (or vice versa) results in no audio output. The two ACM variants are not interchangeable.
How to find your audio RPO code:
Locate the SPID label (typically in the glove box) and look for any code beginning with “UQ” — that’s your audio system. On 2018+ vehicles, scan the QR code on the driver’s door B-pillar with a smartphone QR reader.
WAMS lists both base and Bose ACM options on the Replacement GM Radio/ACM Module page; select your audio RPO from the dropdown when ordering.
Note: GM also uses related codes for active noise cancellation (ANC) amplifiers (UQP, UQT, etc.) on newer vehicles. ANC-equipped amplifiers can introduce feedback when paired with aftermarket subwoofers — an ANC bypass harness may be required.