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Source reference 2007-11-52

Manufacturer communication — 2005 GMC FULL SIZE PICKUP OR UTILITY (YUKON)

Reporter type: Manufacturer

Vehicles as recorded

What the manufacturer’s document says

normal characteristic (no repair) ・ names no model (for full-size utilities)

Applies to

  • The article concerns the 2005-08 full size pickup or utility vehicle.

    the passage
    Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle.

Fault

  • Some customers may comment that the volt gauge fluctuates between 12 and 14 volts.

    the passage
    Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle.

Finding the cause

Possible causes

  • Starting with the 2005 model year these vehicles have a Regulated Voltage Control (RVC) system, which reduces the targeted output voltage to 12.6-13.1 volts in Fuel Economy Mode to improve fuel economy.

    the passage
    Starting with the 2005 model year, these vehicles are equipped with a Regulated Voltage Control (RVC) system. RVC reduces the targeted output voltage to 12.6-13.1 volts when in Fuel Economy Mode to improve fuel economy.

  • The generator may exit Fuel Economy Mode if additional voltage is required, which makes the voltmeter fluctuate between 12 and 14 volts, whereas non-regulated systems usually hold a more consistent reading of 14 volts.

    the passage
    The generator may exit Fuel Economy Mode if additional voltage is required. This causes the voltmeter to fluctuate between 12 and 14 volts (fig. 16) , as opposed to non-regulated systems which usually maintain a more consistent reading of 14 volts.

Correction

Caution

  • This fluctuation with the RVC system is normal system operation; no repairs should be attempted.

    the passage
    This fluctuation with the RVC system is normal system operation. No repairs should be attempted.

  • Refer to the owner manual Section 3 (Instrument Panel), Voltmeter Gage, for more information.

    the passage
    Refer to the owner manual Section 3 (Instrument Panel) Voltmeter Gage for more information.

  • Refer to PIT4426 for concerns with keeping a camper or trailer battery properly charged.

    the passage
    TIP: Refer to PIT4426 for concerns with keeping a camper or trailer battery properly charged.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

  1. Communication summary

    電圧計のふらつき 2005-08 フルサイズピックアップまたはユーティリティ車で、電圧計が 12 ボルトと 14 ボルトの間でふらつく、と指摘する顧客がいる。 2005-08 フルサイズピックアップまたはユーティリティ車で、電圧計が 12 ボルトと 14 ボルトの間でふらつく、と指摘する顧客がいる。 2005 年式から、これらの車両には Regulated Voltage Control（RVC）システムが装備されている。RVC は、燃費を良くするため、フューエルエコノミーモードのときに目標出力電圧を 12.6-13.1 ボルトに下げる。 さらに電圧が必要になると、ジェネレーターはフューエルエコノミーモードを抜けることがある。このため電圧計は 12 ボルトと 14 ボルトの間でふらつく（図 16）。これは、通常 14 ボルトのより安定した値を保つ非レギュレーテッド式のシステムとは異なる。 RVC システムでのこのふらつきは、システムの正常な作動である。修理を試みてはならない。 詳しくはオーナーズマニュアルの Section 3（Instrument Panel）の Voltmeter Gage を参照する。 ヒント：キャンピングカーまたはトレーラーのバッテリーを適切に充電された状態に保つことに関する懸念については、PIT4426 を参照する。 Machine translation (unreviewed)

    Voltmeter Fluctuation Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle. Some customers may comment that the volt gauge fluctuates between 12 and 14 volts on their 2005-08 full size pickup or utility vehicle. Starting with the 2005 model year, these vehicles are equipped with a Regulated Voltage Control (RVC) system. RVC reduces the targeted output voltage to 12.6-13.1 volts when in Fuel Economy Mode to improve fuel economy. The generator may exit Fuel Economy Mode if additional voltage is required. This causes the voltmeter to fluctuate between 12 and 14 volts (fig. 16) , as opposed to non-regulated systems which usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation. No repairs should be attempted. Refer to the owner manual Section 3 (Instrument Panel) Voltmeter Gage for more information. TIP: Refer to PIT4426 for concerns with keeping a camper or trailer battery properly charged.
    Go to this passage in the original

Source

Source
GM TechLink
Source reference
2007-11-52
Received by source
2007-11-01
Incident date
Unknown

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