B1289 on 2007-2010 GMC Sierra 2500: Radio & Audio Failure Causes and Fixes

What's Unique About the 2007-2010 Gmc SIERRA 2500

The GMT900 truck platform (2007-2014), which includes this generation of Sierra, Silverado, Tahoe, and Yukon, is known for this specific electrical issue. General Motors issued TSB #PIT4474D and its successor, PIT4474E, that directly address this code, linking it to a fault in Circuit 7066. Unlike generic definitions that might point elsewhere, on this truck, the code is definitively linked to the infotainment wiring, which is known to chafe and short to ground. A very common failure point is in the headliner harness near the rear entertainment system (if equipped) or sunroof. This makes diagnosis more direct, pointing away from an expensive, and likely unnecessary, radio replacement.

Diagnostic Flowchart

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

Generation note: The 2007 model year was a transition. This issue primarily affects the 'new body style' GMT900 platform trucks sold from 2007-2013/2014. It does not apply to the 'Classic' GMT800 models sold in early 2007.

Symptoms You May Notice

• Radio display is blank or flashes on and off.
• No sound from any speakers.
• Loss of audible chimes for turn signals, door ajar, and other warnings, as they are played through the speakers.
• Rear Seat Entertainment (RSE) or DVD screen is inoperative (if equipped).
• Radio may flash for up to two minutes after startup and then go completely blank.
• The issue may start intermittently, sometimes triggered by hitting a bump in the road.
🎬 Watch: How to fix a blank screen and loss of audio

Most Likely Causes

1. Shorted or Open Wire in Circuit 7066 🔴 High Probability As documented in TSB #PIT4474E, the wiring harness for the entertainment system is known to chafe and short to ground. Common failure points are in the headliner near the rear DVD player or sunroof, or up the passenger-side B-pillar where the harness can rub against a metal support bracket.
   How to confirm: Inspect the wiring harness, particularly under the headliner near the rear DVD unit. Test Circuit 7066 (almost always a pink wire for this fault) for a short to ground or an open circuit using a multimeter. At the back of the radio, this wire is located at Pin B3 in the 24-pin X1 connector. 🎬 See why your radio isn't working and how to diagnose it A professional scan tool may show a specific sub-code like B1289 02 (Short to Ground) or B1289 04 (Open Circuit).
   Typical fix: Repair the damaged section of the wire. This involves cutting out the bad portion and splicing in a new piece of 18-22 AWG wire using butt connectors and heat shrink tubing, or by soldering. Protect the repaired area with loom or tape to prevent future chafing.
   Est. part cost: $1-$15

Rare But Worth Checking

• Internal Radio Head Unit Failure: While less common than the wiring issue, the radio's internal driver circuit that sends the signal can fail. This should only be considered after the wiring in Circuit 7066 has been thoroughly inspected and confirmed to be intact. Mail-in repair services are a cost-effective option if the unit is faulty. Some owners have reported success by re-soldering cracked joints on the internal circuit board, particularly for the flat ribbon cable connecting the display.
• Poor Ground Connection: A loose or corroded ground connection for the Body Control Module (BCM) or chassis can cause a wide range of electrical issues. TSB PIT5562 notes that some ground bolts on these trucks may not have been properly secured, leading to poor connections that can cause various unpredictable electrical symptoms. Key grounds for the radio are G200 (passenger A-pillar) and G201 (driver's A-pillar).

Diagnosis Steps

1. Confirm the symptoms: radio screen is blank or flashing, and there is no audio.
2. Scan for Diagnostic Trouble Codes (DTCs) to verify B1289 is present, noting any other codes like B1265 or B1288. A professional scan tool may reveal symptom bytes like '02' for short to ground.
3. Perform a 'hard reset' by turning the ignition off, opening the driver's door, and waiting at least 5 minutes. This allows the radio's internal protection circuit to reset. If the radio works temporarily upon restart, it strongly points to a persistent short.
4. If the vehicle has a rear entertainment system, the most likely failure point is the wiring harness under the headliner. Carefully lower the headliner (starting at the rear or passenger side) to visually inspect the harness for chafing or pinched wires, especially near metal brackets, the DVD unit, or a sunroof motor.
5. Locate Circuit 7066 (typically a pink, dark green, or purple wire depending on specific options and year). At the radio connector (X1), this is Pin B3.
6. With the radio connector unplugged, use a multimeter set to resistance (Ohms) to test Pin B3 on the harness side for continuity to a known good chassis ground. A reading of near zero ohms indicates a short to ground, confirming the wiring fault.
7. Alternatively, test for voltage at Pin B3 with the radio plugged in and turned on. It should read a discrete 12V signal. A reading of 0V indicates an open circuit or a short to ground.
8. If a short is found, trace the harness to locate the damaged section of wire, repair it, and protect it from future damage using loom or rerouting.
9. If no wiring fault is found after a thorough inspection, the issue may be an internal failure of the radio head unit itself.

Parts You'll Likely Need

• Wiring Repair Supplies — The most common fix is repairing a broken or shorted wire in Circuit 7066, which requires basic wiring supplies like wire, butt connectors, and heat shrink tubing.
  Trusted brands: 3M
  OEM price range: $1-$15
  Aftermarket price range: $1-$15
• Radio / Navigation Head Unit (OEM #20883056, 22776896, 25966512) — This is only needed if the wiring is confirmed to be good and the radio has failed internally. A mail-in repair service is a cost-effective alternative to buying a new or refurbished unit.
  Trusted brands: ACDelco (OEM), Various mail-in repair services
  OEM price range: $500-$1200
  Aftermarket price range: $150-$400 (Mail-in Repair/Used)

Related Codes That Often Appear With This One

• B1265 — This code is also related to the entertainment system and is explicitly mentioned alongside B1289 in TSB PIT4474E as a companion code for the same fault in Circuit 7066.
• B1288 — Like B1265, this is another entertainment system code mentioned in TSB PIT4474E that can be set by the same wiring fault in Circuit 7066.

Technical Service Bulletins (TSBs) & Recalls

• PIT4474E: (Supersedes PIT4474D) Addresses a blank or flashing radio/navigation display, no sound, and inoperative rear DVD screen. Points to a short-to-ground fault in circuit 7066 and advises repair.
• PIT4474D: The original bulletin identifying the same issue and fix.
• PIT5562: A general bulletin regarding various electrical issues that can be caused by improperly torqued ground bolts, representing a less common but possible cause.

Platform-Specific Known Issues

• TSB PIT4474E: The Definitive Guide: GM Technical Service Bulletin #PIT4474E explicitly identifies DTC B1289 (along with B1265 and B1288) with a blank/flashing display and no audio, directing technicians to find and repair a short to ground on 'circuit 7066' (Remote Enable Signal). It notes the most common location for the short is in the headliner harness near the rear DVD screen.
• Owner Experience: The Pink Wire in the Headliner: Countless owners on forums like gm-trucks.com and tahoeyukonforum.com have documented this exact failure. A common story involves finding the pink wire in the harness that runs along the passenger side of the headliner chafed and shorting against a metal roof support bracket. A simple splice and protecting the wire with electrical tape or loom permanently resolves the problem.

Mechanic-Grade Diagnostic Values

• Entertainment Remote Enable Circuit (Circuit 7066) Voltage — expected: Discrete 12V signal when radio is commanded ON.. Failure: 0V or significantly less than 12V indicates an open circuit or a short to ground. The DTC may set if the fault is detected for more than 250 milliseconds.
• Resistance to Ground on Circuit 7066 — expected: OL (Open Line / infinite resistance) when testing the unplugged harness wire to chassis ground.. Failure: A reading of near 0 Ohms indicates a direct short to ground.

Hidden / Shadow Codes Worth Checking

• B1289 01: Video Display Brightness Control Signal Short to Battery (see via GM GDS2 or Tech2 professional scan tool.)
• B1289 02: Video Display Brightness Control Signal Short to Ground. This is the most common symptom byte for this issue. (see via GM GDS2 or Tech2 professional scan tool.)
• B1289 04: Video Display Brightness Control Signal Open Circuit. (see via GM GDS2 or Tech2 professional scan tool.)

Wiring & Ground Locations

• Circuit 7066 — Pin B3 at the 24-pin X1 radio connector. The wire color is typically pink, but can also be dark green or purple depending on vehicle options and year.. This is the specific wire that carries the remote turn-on signal. TSB PIT4474E identifies a fault in this circuit as the primary cause of code B1289.
• G200 — In the instrument panel in the right front corner, near the passenger A-pillar, behind the plastic trim.. This is a major ground point for the instrument panel and various electronic modules on the passenger side, including the radio.
• G201 — In the upper left corner of the instrument panel, near the driver's A-pillar, behind the plastic trim.. This is a critical ground splice pack for many interior components. A loose or corroded G201 can cause a wide array of unpredictable electrical issues.
• G303 — On the left side (driver's side) B-pillar, behind the trim panel.. The wiring harness containing Circuit 7066 often runs up the B-pillar. A fault with this ground could potentially cause issues, though it's less common than a chafed wire.

Real Owner Repair Stories

• Go-Parts.com Repair Database (2007-2014 Chevrolet Suburban (GMT900 Platform)) — Radio/Nav screen flashing or blank, no audio, no turn signal clicks.
  ❌ Tried (didn't work) Checked all radio and infotainment related fuses (RADIO, AMP, INFO); all were good., Disconnected the battery for 30 minutes to reset the system; the problem returned immediately.
  ✅ What actually fixed it Owner found TSB PIT4474E. Lowered the rear of the headliner near the flip-down DVD screen and found the wiring harness. A purple wire (Circuit 7066) was found chafed and shorting against a metal support bracket. The wire was repaired, solving the issue.

OEM Part Supersession History

• 25966512 → 20883056 — Part update/revision.
• 20883056 → 22776896 — Part update/revision.
  Heads up: While these parts supersede each other, replacement radios often require VIN programming by a dealer to function correctly and communicate with other vehicle modules.

Model Year Variations Within This Range

• 2007-2014: The wire color for Circuit 7066 can vary. While often cited as pink, it can also be dark green or purple depending on the specific vehicle options (Bose vs. non-Bose, Navigation, RSE) and model year. Diagnosis should focus on the circuit number and pin location (Pin B3 at connector X1) rather than solely on wire color.